Lingua: Inglese
Editore: Springer Berlin / Heidelberg, 1984
ISBN 10: 3540133720 ISBN 13: 9783540133728
Da: Better World Books, Mishawaka, IN, U.S.A.
Condizione: Very Good. Former library copy. Pages intact with possible writing/highlighting. Binding strong with minor wear. Dust jackets/supplements may not be included. Includes library markings. Stock photo provided. Product includes identifying sticker. Better World Books: Buy Books. Do Good.
Lingua: Inglese
Editore: Springer Berlin / Heidelberg, 1981
ISBN 10: 3540108564 ISBN 13: 9783540108566
Da: Better World Books, Mishawaka, IN, U.S.A.
Condizione: Very Good. Former library copy. Pages intact with possible writing/highlighting. Binding strong with minor wear. Dust jackets/supplements may not be included. Includes library markings. Stock photo provided. Product includes identifying sticker. Better World Books: Buy Books. Do Good.
Lingua: Inglese
Editore: Berlin - Heidelberg - New York: Springer Verlag 1988, 1988
ISBN 10: 354050110X ISBN 13: 9783540501107
Da: Antikvariat Valentinska, Praha, Repubblica Ceca
Membro dell'associazione: ILAB
EUR 25,00
Quantità: 1 disponibili
Aggiungi al carrelloOBrosch., IX+562, 16,5 x 24 cm, Deckel leicht verschmutzt u. vorne befleckt, Seitenränder leicht ausgeblichen, sonst innen unbeschädigt u. schön, insgesamt sehr guter Zustand. Book Language/s: English.
Condizione: Good. *Price HAS BEEN REDUCED by 10% until Monday, June 15 (sale item)* 562 pp., softcover, ex library, else text clean & binding tight. - If you are reading this, this item is actually (physically) in our stock and ready for shipment once ordered. We are not bookjackers. Buyer is responsible for any additional duties, taxes, or fees required by recipient's country.
Condizione: As New. Unread book in perfect condition.
Condizione: As New. Unread book in perfect condition.
Lingua: Inglese
Editore: Berlin ; Heidelberg [u.a.] : Springer, 1981
ISBN 10: 3540108564 ISBN 13: 9783540108566
Da: Roland Antiquariat UG haftungsbeschränkt, Weinheim, Germania
EUR 24,90
Quantità: 1 disponibili
Aggiungi al carrelloSoftcover. 1981. XI, 589 S. : graph. Darst. Edition 1981! Unread book. Very good condition. Slight traces of storage. 9783540108566 Sprache: Englisch Gewicht in Gramm: 1001.
Da: Ria Christie Collections, Uxbridge, Regno Unito
EUR 60,65
Quantità: Più di 20 disponibili
Aggiungi al carrelloCondizione: New. In.
Da: Ria Christie Collections, Uxbridge, Regno Unito
EUR 60,65
Quantità: Più di 20 disponibili
Aggiungi al carrelloCondizione: New. In.
Condizione: New.
Condizione: New.
Condizione: New. pp. 608.
Lingua: Inglese
Editore: Springer Berlin Heidelberg, 1984
ISBN 10: 3540133720 ISBN 13: 9783540133728
Da: moluna, Greven, Germania
EUR 48,37
Quantità: Più di 20 disponibili
Aggiungi al carrelloCondizione: New.
EUR 106,20
Quantità: 1 disponibili
Aggiungi al carrelloCondizione: Acceptable. Used - Acceptable. Ex-library with wear - may contain significant amounts of highlighting and underlining in pen or pencil. Your purchase helps support Sri Lankan Children's Charity 'The Rainbow Centre'. Our donations to The Rainbow Centre have helped provide an education and a safe haven to hundreds of children who live in appalling conditions.
Lingua: Inglese
Editore: Springer Berlin Heidelberg, 1981
ISBN 10: 3540108564 ISBN 13: 9783540108566
Da: AHA-BUCH GmbH, Einbeck, Germania
EUR 53,49
Quantità: 1 disponibili
Aggiungi al carrelloTaschenbuch. Condizione: Neu. Druck auf Anfrage Neuware - Printed after ordering - The complexity of manipulating hierarchically defined sets of rectangles.- The transformational machine: Theme and variations.- Probabilistic two-way machines.- A survey of some recent results on computational complexity in weak theories of arithmetic.- A survey on oracle techniques.- Time and space bounded complexity classes and bandwidth constrained problems.- Representations of graphs by means of products and their complexity.- Parsing strategies: A concise survey.- The art of dynamizing.- Fast parallel computation of polynomials using few processors.- Generalizations of Petri nets.- Partial match retrieval in implicit data structures.- A characterization of Floyd-provable programs.- Semantics of CSP via translation into CCS.- More about the geography of context-free languages.- On the power of algebraic specifications.- An application of the theory of free partially commutative monoids: Asymptotic densities of trace languages.- On the complexity of word problems in certain Thue systems.- On the transformation of derivation graphs to derivation trees.- Pushdown automata with restricted use of storage symbols.- Structured nets.- Retraceability, repleteness and busy beaver sets.- Combining T and level-N.- On realization and implementation.- Multiplicative complexity of a bilinear form over a commutative ring.- Making dynamic logic first-order.- Partial interpretations of program schemata.- Closure properties of the family of languages recognized by one-way two-head deterministic finite state automata.- Another hierarchy defined by multihead finite automata.- An extension of Rabin's complete proof concept.- How to find invariants for coloured Petri nets.- Relationships between probabilistic and deterministic tape complexity.- Grammatical levels of the position restricted grammars.- A general framework for comparing sequential and parallel rewriting.- A bin packing algorithm with complexity O(n log n) and performance 1 in the stochastic limit.- Codings of nonnegative integers.- The maximum k-flow in a network.- On the constructive description of graph languages accepted by finite automata.- Weighted multidimensional B-trees used as nearly optimal dynamic dictionaries.- Maximum flow in planar networks.- Probabilistic combinatorial optimization.- Time-processor trade-offs for universal parallel computers.- Negative results on the size of deterministic right parsers.- Key-equivalence of functional dependency statements systems.- On representation of dynamic algebras with reversion.- A framework for studying grammars.- On existence of complete predicate calculus in metamathematics without exponentiation.- On structural similarity of context-free grammars.- Axioms for the term-wise correctness of programs.- Complexity and entropy.- Axiomatic semantics of indirect addressing.- Testing of join dependency preserving by a modified chase method.- A starvation-free solution of the dining philosophers' problem by use of interaction systems.- Admissible representations of effective cpo's.- Preserving total order in constant expected time.- Constructive category theory (No. 1).- Two pebbles don't suffice.
Lingua: Inglese
Editore: Springer Berlin Heidelberg, 1984
ISBN 10: 3540133720 ISBN 13: 9783540133728
Da: AHA-BUCH GmbH, Einbeck, Germania
EUR 53,49
Quantità: 1 disponibili
Aggiungi al carrelloTaschenbuch. Condizione: Neu. Druck auf Anfrage Neuware - Printed after ordering - Separating, strongly separating, and collapsing relativized complexity classes.- Complexity of quantifier elimination in the theory of algebraically closed fields.- Systolic automata ¿ power, characterizations, nonhomogeneity.- A note on unique decipherability.- Outline of an algebraic language theory.- Thue systems and the Church-Rosser property.- Limits, higher type computability and type-free languages.- Traces, histories, graphs: Instances of a process monoid.- Recent results on automata and infinite words.- VLSI algorithms and architectures.- Decidability of monadic theories.- On the Ehrenfeucht conjecture on test sets and its dual version.- Sparse oracles, lowness, and highness.- Computability of probabilistic parameters for some classes of formal languages.- A truely morphic characterization of recursively enumerable sets.- On the Herbrand Kleene universe for nondeterministic computations.- An investigation of controls for concurrent systems by abstract control languages.- On generalized words of Thue-Morse.- Nondeterminism is essential for two-way counter machines.- Weak and strong fairness in CCS.- On the complexity of inductive inference.- Monotone edge sequences in line arrangements and applications.- Many-sorted temporal logic for multi-processes systems.- Process logics : two decidability results.- On searching of special classes of mazes and finite embedded graphs.- The power of the future perfect in program logics.- Hierarchy of reversal and zerotesting bounded multicounter machines.- On the power of alternation in finite automata.- The equivalence problem and correctness formulas for a simple class of programs.- Lower bounds for polygon simplicity testing and other problems.- A uniform independence of invariant sentences.- On the equivalence of compositions of morphisms and inverse morphisms on regular languages.- Some connections between presentability of complexity classes and the power of formal systems of reasoning.- Finding a maximum flow in /s,t/-planar network in linear expected time.- Nondeterministic logspace reductions.- Factoring multivariate polynomials over algebraic number fields.- G¿del numberings, principal morphisms, combinatory algebras.- Representations of integers and language theory.- New lower bound for polyhedral membership problem with an application to linear programming.- Decidability of the equivalence problem for synchronous deterministic pushdown automata.- Models and operators for nondeterministic processes.- Algorithms for string editing which permit arbitrarily complex edit constraints.- The structure of polynomial complexity cores.- Solving visibility problems by using skeleton structures.- Another look at parameterization using algebras with subsorts.- A lower bound on complexity of branching programs.- From dynamic algebras to test algebras.- Combinatorial games with exponential space complete decision problems.- Fast recognitions of pushdown automaton and context-free languages.- Multiprocessor systems and their concurrency.- Free constructions in algebraic institutions.- Remarks on comparing expressive power of logics of programs.- The complexity of problems concerning graphs with regularities.- On the complexity of slice functions.- An exponential lower bound for one-time-only branching programs.- A topological view of some problems in complexity theory.- Propositional dynamic logic with strong loop predicate.
Da: preigu, Osnabrück, Germania
EUR 50,25
Quantità: 5 disponibili
Aggiungi al carrelloTaschenbuch. Condizione: Neu. Mathematical Foundations of Computer Science 1981 | 10th Symposium Strbske Pleso, Czechoslovakia, August 31- September 4, 1981. Proceedings | J. Gruska (u. a.) | Taschenbuch | xi | Englisch | 1981 | Springer | EAN 9783540108566 | Verantwortliche Person für die EU: Springer Verlag GmbH, Tiergartenstr. 17, 69121 Heidelberg, juergen[dot]hartmann[at]springer[dot]com | Anbieter: preigu.
Da: preigu, Osnabrück, Germania
EUR 50,25
Quantità: 5 disponibili
Aggiungi al carrelloTaschenbuch. Condizione: Neu. Mathematical Foundations of Computer Science 1984 | 11th Symposium Praha, Czechoslovakia September 3-7, 1984. Proceedings | M. P. Chytil (u. a.) | Taschenbuch | xiv | Englisch | 1984 | Springer | EAN 9783540133728 | Verantwortliche Person für die EU: Springer Verlag GmbH, Tiergartenstr. 17, 69121 Heidelberg, juergen[dot]hartmann[at]springer[dot]com | Anbieter: preigu.
Da: Mispah books, Redhill, SURRE, Regno Unito
EUR 109,84
Quantità: 1 disponibili
Aggiungi al carrelloPaperback. Condizione: Very Good. Very Good. book.
Da: Mispah books, Redhill, SURRE, Regno Unito
EUR 120,58
Quantità: 1 disponibili
Aggiungi al carrelloPaperback. Condizione: Very Good. Dust Jacket may NOT BE INCLUDED.CDs may be missing. SHIPS FROM MULTIPLE LOCATIONS. book.
EUR 302,06
Quantità: 1 disponibili
Aggiungi al carrellopaperback. Condizione: Acceptable. Acceptable. Dust Jacket NOT present. CD WILL BE MISSING. SHIPS FROM MULTIPLE LOCATIONS. book.
Lingua: Inglese
Editore: Springer Berlin Heidelberg, Springer Berlin Heidelberg Aug 1984, 1984
ISBN 10: 3540133720 ISBN 13: 9783540133728
Da: BuchWeltWeit Ludwig Meier e.K., Bergisch Gladbach, Germania
EUR 53,49
Quantità: 2 disponibili
Aggiungi al carrelloTaschenbuch. Condizione: Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -Separating, strongly separating, and collapsing relativized complexity classes.- Complexity of quantifier elimination in the theory of algebraically closed fields.- Systolic automata ¿ power, characterizations, nonhomogeneity.- A note on unique decipherability.- Outline of an algebraic language theory.- Thue systems and the Church-Rosser property.- Limits, higher type computability and type-free languages.- Traces, histories, graphs: Instances of a process monoid.- Recent results on automata and infinite words.- VLSI algorithms and architectures.- Decidability of monadic theories.- On the Ehrenfeucht conjecture on test sets and its dual version.- Sparse oracles, lowness, and highness.- Computability of probabilistic parameters for some classes of formal languages.- A truely morphic characterization of recursively enumerable sets.- On the Herbrand Kleene universe for nondeterministic computations.- An investigation of controls for concurrent systems by abstract control languages.- On generalized words of Thue-Morse.- Nondeterminism is essential for two-way counter machines.- Weak and strong fairness in CCS.- On the complexity of inductive inference.- Monotone edge sequences in line arrangements and applications.- Many-sorted temporal logic for multi-processes systems.- Process logics : two decidability results.- On searching of special classes of mazes and finite embedded graphs.- The power of the future perfect in program logics.- Hierarchy of reversal and zerotesting bounded multicounter machines.- On the power of alternation in finite automata.- The equivalence problem and correctness formulas for a simple class of programs.- Lower bounds for polygon simplicity testing and other problems.- A uniform independence of invariant sentences.- On the equivalence of compositions of morphisms and inverse morphisms on regular languages.- Some connections between presentability of complexity classes and the power of formal systems of reasoning.- Finding a maximum flow in /s,t/-planar network in linear expected time.- Nondeterministic logspace reductions.- Factoring multivariate polynomials over algebraic number fields.- G¿del numberings, principal morphisms, combinatory algebras.- Representations of integers and language theory.- New lower bound for polyhedral membership problem with an application to linear programming.- Decidability of the equivalence problem for synchronous deterministic pushdown automata.- Models and operators for nondeterministic processes.- Algorithms for string editing which permit arbitrarily complex edit constraints.- The structure of polynomial complexity cores.- Solving visibility problems by using skeleton structures.- Another look at parameterization using algebras with subsorts.- A lower bound on complexity of branching programs.- From dynamic algebras to test algebras.- Combinatorial games with exponential space complete decision problems.- Fast recognitions of pushdown automaton and context-free languages.- Multiprocessor systems and their concurrency.- Free constructions in algebraic institutions.- Remarks on comparing expressive power of logics of programs.- The complexity of problems concerning graphs with regularities.- On the complexity of slice functions.- An exponential lower bound for one-time-only branching programs.- A topological view of some problems in complexity theory.- Propositional dynamic logic with strong loop predicate. 600 pp. Englisch.
Lingua: Inglese
Editore: Springer Berlin Heidelberg, Springer Berlin Heidelberg Aug 1981, 1981
ISBN 10: 3540108564 ISBN 13: 9783540108566
Da: BuchWeltWeit Ludwig Meier e.K., Bergisch Gladbach, Germania
EUR 53,49
Quantità: 2 disponibili
Aggiungi al carrelloTaschenbuch. Condizione: Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -The complexity of manipulating hierarchically defined sets of rectangles.- The transformational machine: Theme and variations.- Probabilistic two-way machines.- A survey of some recent results on computational complexity in weak theories of arithmetic.- A survey on oracle techniques.- Time and space bounded complexity classes and bandwidth constrained problems.- Representations of graphs by means of products and their complexity.- Parsing strategies: A concise survey.- The art of dynamizing.- Fast parallel computation of polynomials using few processors.- Generalizations of Petri nets.- Partial match retrieval in implicit data structures.- A characterization of Floyd-provable programs.- Semantics of CSP via translation into CCS.- More about the geography of context-free languages.- On the power of algebraic specifications.- An application of the theory of free partially commutative monoids: Asymptotic densities of trace languages.- On the complexity of word problems in certain Thue systems.- On the transformation of derivation graphs to derivation trees.- Pushdown automata with restricted use of storage symbols.- Structured nets.- Retraceability, repleteness and busy beaver sets.- Combining T and level-N.- On realization and implementation.- Multiplicative complexity of a bilinear form over a commutative ring.- Making dynamic logic first-order.- Partial interpretations of program schemata.- Closure properties of the family of languages recognized by one-way two-head deterministic finite state automata.- Another hierarchy defined by multihead finite automata.- An extension of Rabin's complete proof concept.- How to find invariants for coloured Petri nets.- Relationships between probabilistic and deterministic tape complexity.- Grammatical levels of the position restricted grammars.- A general framework for comparing sequential and parallel rewriting.- A bin packing algorithm with complexity O(n log n) and performance 1 in the stochastic limit.- Codings of nonnegative integers.- The maximum k-flow in a network.- On the constructive description of graph languages accepted by finite automata.- Weighted multidimensional B-trees used as nearly optimal dynamic dictionaries.- Maximum flow in planar networks.- Probabilistic combinatorial optimization.- Time-processor trade-offs for universal parallel computers.- Negative results on the size of deterministic right parsers.- Key-equivalence of functional dependency statements systems.- On representation of dynamic algebras with reversion.- A framework for studying grammars.- On existence of complete predicate calculus in metamathematics without exponentiation.- On structural similarity of context-free grammars.- Axioms for the term-wise correctness of programs.- Complexity and entropy.- Axiomatic semantics of indirect addressing.- Testing of join dependency preserving by a modified chase method.- A starvation-free solution of the dining philosophers' problem by use of interaction systems.- Admissible representations of effective cpo's.- Preserving total order in constant expected time.- Constructive category theory (No. 1).- Two pebbles don't suffice. 608 pp. Englisch.
Da: Majestic Books, Hounslow, Regno Unito
EUR 79,56
Quantità: 4 disponibili
Aggiungi al carrelloCondizione: New. Print on Demand pp. 608 49:B&W 6.14 x 9.21 in or 234 x 156 mm (Royal 8vo) Perfect Bound on White w/Gloss Lam.
Da: Biblios, Frankfurt am main, HESSE, Germania
EUR 78,97
Quantità: 4 disponibili
Aggiungi al carrelloCondizione: New. PRINT ON DEMAND pp. 608.
Lingua: Inglese
Editore: Springer Berlin Heidelberg, 1981
ISBN 10: 3540108564 ISBN 13: 9783540108566
Da: moluna, Greven, Germania
EUR 48,37
Quantità: Più di 20 disponibili
Aggiungi al carrelloCondizione: New. Dieser Artikel ist ein Print on Demand Artikel und wird nach Ihrer Bestellung fuer Sie gedruckt. The complexity of manipulating hierarchically defined sets of rectangles.- The transformational machine: Theme and variations.- Probabilistic two-way machines.- A survey of some recent results on computational complexity in weak theories of arithmetic.- A s.
Lingua: Inglese
Editore: Springer, Springer Aug 1984, 1984
ISBN 10: 3540133720 ISBN 13: 9783540133728
Da: buchversandmimpf2000, Emtmannsberg, BAYE, Germania
EUR 53,49
Quantità: 1 disponibili
Aggiungi al carrelloTaschenbuch. Condizione: Neu. This item is printed on demand - Print on Demand Titel. Neuware -Separating, strongly separating, and collapsing relativized complexity classes.- Complexity of quantifier elimination in the theory of algebraically closed fields.- Systolic automata - power, characterizations, nonhomogeneity.- A note on unique decipherability.- Outline of an algebraic language theory.- Thue systems and the Church-Rosser property.- Limits, higher type computability and type-free languages.- Traces, histories, graphs: Instances of a process monoid.- Recent results on automata and infinite words.- VLSI algorithms and architectures.- Decidability of monadic theories.- On the Ehrenfeucht conjecture on test sets and its dual version.- Sparse oracles, lowness, and highness.- Computability of probabilistic parameters for some classes of formal languages.- A truely morphic characterization of recursively enumerable sets.- On the Herbrand Kleene universe for nondeterministic computations.- An investigation of controls for concurrent systems by abstract control languages.- On generalized words of Thue-Morse.- Nondeterminism is essential for two-way counter machines.- Weak and strong fairness in CCS.- On the complexity of inductive inference.- Monotone edge sequences in line arrangements and applications.- Many-sorted temporal logic for multi-processes systems.- Process logics : two decidability results.- On searching of special classes of mazes and finite embedded graphs.- The power of the future perfect in program logics.- Hierarchy of reversal and zerotesting bounded multicounter machines.- On the power of alternation in finite automata.- The equivalence problem and correctness formulas for a simple class of programs.- Lower bounds for polygon simplicity testing and other problems.- A uniform independence of invariant sentences.- On the equivalence ofcompositions of morphisms and inverse morphisms on regular languages.- Some connections between presentability of complexity classes and the power of formal systems of reasoning.- Finding a maximum flow in /s,t/-planar network in linear expected time.- Nondeterministic logspace reductions.- Factoring multivariate polynomials over algebraic number fields.- Gödel numberings, principal morphisms, combinatory algebras.- Representations of integers and language theory.- New lower bound for polyhedral membership problem with an application to linear programming.- Decidability of the equivalence problem for synchronous deterministic pushdown automata.- Models and operators for nondeterministic processes.- Algorithms for string editing which permit arbitrarily complex edit constraints.- The structure of polynomial complexity cores.- Solving visibility problems by using skeleton structures.- Another look at parameterization using algebras with subsorts.- A lower bound on complexity of branching programs.- From dynamic algebras to test algebras.- Combinatorial games with exponential space complete decision problems.- Fast recognitions of pushdown automaton and context-free languages.- Multiprocessor systems and their concurrency.- Free constructions in algebraic institutions.- Remarks on comparing expressive power of logics of programs.- The complexity of problems concerning graphs with regularities.- On the complexity of slice functions.- An exponential lower bound for one-time-only branching programs.- A topological view of some problems in complexity theory.- Propositional dynamic logic with strong loop predicate.Springer-Verlag KG, Sachsenplatz 4-6, 1201 Wien 600 pp. Englisch.
Lingua: Inglese
Editore: Springer, Springer Aug 1981, 1981
ISBN 10: 3540108564 ISBN 13: 9783540108566
Da: buchversandmimpf2000, Emtmannsberg, BAYE, Germania
EUR 53,49
Quantità: 1 disponibili
Aggiungi al carrelloTaschenbuch. Condizione: Neu. This item is printed on demand - Print on Demand Titel. Neuware -The complexity of manipulating hierarchically defined sets of rectangles.- The transformational machine: Theme and variations.- Probabilistic two-way machines.- A survey of some recent results on computational complexity in weak theories of arithmetic.- A survey on oracle techniques.- Time and space bounded complexity classes and bandwidth constrained problems.- Representations of graphs by means of products and their complexity.- Parsing strategies: A concise survey.- The art of dynamizing.- Fast parallel computation of polynomials using few processors.- Generalizations of Petri nets.- Partial match retrieval in implicit data structures.- A characterization of Floyd-provable programs.- Semantics of CSP via translation into CCS.- More about the 'geography' of context-free languages.- On the power of algebraic specifications.- An application of the theory of free partially commutative monoids: Asymptotic densities of trace languages.- On the complexity of word problems in certain Thue systems.- On the transformation of derivation graphs to derivation trees.- Pushdown automata with restricted use of storage symbols.- Structured nets.- Retraceability, repleteness and busy beaver sets.- Combining T and level-N.- On realization and implementation.- Multiplicative complexity of a bilinear form over a commutative ring.- Making dynamic logic first-order.- Partial interpretations of program schemata.- Closure properties of the family of languages recognized by one-way two-head deterministic finite state automata.- Another hierarchy defined by multihead finite automata.- An extension of Rabin's complete proof concept.- How to find invariants for coloured Petri nets.- Relationships between probabilistic and deterministic tape complexity.- Grammatical levels of the position restricted grammars.- A general framework for comparing sequential and parallel rewriting.- A bin packing algorithm with complexity O(n log n) and performance 1 in the stochastic limit.- Codings of nonnegative integers.- The maximum k-flow in a network.- On the constructive description of graph languages accepted by finite automata.- Weighted multidimensional B-trees used as nearly optimal dynamic dictionaries.- Maximum flow in planar networks.- Probabilistic combinatorial optimization.- Time-processor trade-offs for universal parallel computers.- Negative results on the size of deterministic right parsers.- Key-equivalence of functional dependency statements systems.- On representation of dynamic algebras with reversion.- A framework for studying grammars.- On existence of complete predicate calculus in metamathematics without exponentiation.- On structural similarity of context-free grammars.- Axioms for the term-wise correctness of programs.- Complexity and entropy.- Axiomatic semantics of indirect addressing.- Testing of join dependency preserving by a modified chase method.- A starvation-free solution of the dining philosophers' problem by use of interaction systems.- Admissible representations of effective cpo's.- Preserving total order in constant expected time.- Constructive category theory (No. 1).- Two pebbles don't suffice.Springer-Verlag KG, Sachsenplatz 4-6, 1201 Wien 608 pp. Englisch.