The Computational Complexity of Logical Theories

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718 Jeanne Ferrante

Charles W. Rackoff

The Computational Complexity of Logical Theories

Springer-Verlag Berlin Heidelberg New York 1979

Authors Jeanne Ferrante Automatic Programming Group IBM T. J. Watson Research Center Box 218 Yorktown Heights, NY 10598 USA Charles W. Rackoff Department of Computer Science University of Toronto Toronto, Ontario Canada M5S 1A?

A M S Subject Classifications (1970) 02 B10, 02F10, 0 2 G 0 5 , 6 9 A 2 0 , 68A40 ISBN 3-540-09501-2 Springer-Verlag Berlin Heidelberg NewYork ISBN 0-38?-09501-2 Springer-Verlag NewYork Heidelberg Berlin Library of Congress Cataloging in Publication Data Ferrante, Jeanne,1949- The computational complexttyof logical theories. (Lecture notes in mathematics ; 718) Bibliography: p. Includes index. 1. Predicate calculus. 2. Computational complexity. I. Rackoff, Charles W., 1948- joint author. II. Title. III. Ser~es: Lecture notes in mathematics (Berlin) ; 718. QA3.L28 no. 718 [QA9.35] 510'.8s [511'.3] 79-15338 This work is subject to copyright. All rights are reserved, whether the whole or part of the material is concerned, specifically those of translation, reprinting, re-use of illustrations, broadcasting, reproduction by photocopying machine or similar means, and storage in data banks. Under § 54 of the German Copyright Law where copies are made for other than private use, a fee is payable to the publisher, the amount of the fee to be determined by agreement with the publishel © by Springer-Verlag Berlin Heidelberg 1979 Printed in Germany Printing and binding: Beltz Offsetdruck, Hemsbach/Bergstr. 2141/3140-543210

PREFACE Since

the early

been i n t e r e s t e d predicate true

in decision

calculus.

about a particular

the first

early of

decision

validity

of

the integers

wasn't

t o have f o r m a l

theory

multiplication

let

until

necessary

order

alone

is

result of the is

concept sets

sets.

notions

integers

or t h e s e t class

in

set of

the

sentences true

of structures.

was L ~ w e n h e i m ' s

for

have

of sentences

One o f

procedure

calculus.

the first-order

has e x i s t e d

for

some t h e o r i e s

thirties

that

time,

it

of computation,

Kleene,

Another theory

It

to

was f i r s t

as p r o v i d e d

Post and T u r i n g .

At the present

be

was p o s s i b l e

famous theorem t h a t

was f e l t it

the difficulty

the sixties

might

by t h e

The f i r s t the first-

of addition

and

t i m e an enormous

results

are

known;

these results.

than that

a long

it

such c o n j e c t u r e s .

and u n d e c i d a b i l i t y

investigating

was i n

that

u n d e r the o p e r a t i o n s

a good s u r v e y o f

of comparing

It

prove,

was G ~ d e l ' s

about a theory

have s t a r t e d

the

not decidable.

For a l o n g stronger

we mean t h e

procedure

such as C h u r c h ,

number o f d e c i d a b i l i t y [ELTT65]

theories

t h e monadic p r e d i c a t e

some p e o p l e f e l t

state,

undecidability

in

logicians

under addition.

it

people

for

procedur~ discovered

ca