Software Development

Advances in Computers, Vol. 14 by Morris Rubinoff, Marshall C. Yovits PDF

By Morris Rubinoff, Marshall C. Yovits

ISBN-10: 012012114X

ISBN-13: 9780120121144

Considering its first quantity in 1960, Advances in pcs has offered particular insurance of concepts in and software program and in laptop conception, layout, and functions. It has additionally supplied individuals with a medium during which they could research their matters in better intensity and breadth than that allowed by way of commonplace magazine articles. hence, many articles became typical references that remain of important, lasting worth regardless of the quick progress happening within the box.

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Extra info for Advances in Computers, Vol. 14

Example text

L in N D C S L implies L in N D C S L 3. DCSL E NP(P) - iff LLBAis in NDCSL. iff L L ~isAin N P ( P ) iff LRis in N P ( P ) . The proof is quite similar to the previous proofs that LUTand LR*are complete in PTAPE. It is interesting to note that if LLBA of LR* can be rccognized on a deterministic lba, then all nondeterministic tape computations using Li ( n ) 2 n STRUCTURE OF FEASIBLE COMPUTATIONS 29 tape can be replaced by equivalent deterministic computations using no more tape. Furthermore, there is a recursive translation which maps the nondeterministic Turing machines onto the equivalent deterministic Turing machines.

We recall that Pressburger arithmetic consists of the true statements about integer arithmetic which can be expressed by using successor function S, addition, arid equality. /I where x is not free in A and AIr](y) means y substituted for every occurrence of x in A (induction scheme). The theory can express any fact about the integers that does not involve multiplication. For example, by writing, S ( S . . S ( 0 ) . ) iti;nea we get a formula that denotes the integer i; by writing x+x+ . . +x n time8 26 J.

Problem will not be solved in spite of a concentrated research effort. The P = PTAPE? problem seems more likely to bc resolved in the not too distant future. It is also interesting to note that the P = NP? problem cannot be gcneralized (abstracted) very much. Already for random access machines with multiplication we have that PTIME-MRAM = NPTIME-MRAM and, as mentioned in the text, there exist recursive operations which, added to the random access machine opcrations, guarantee that the corresponding P and N P classes are different.

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Advances in Computers, Vol. 14 by Morris Rubinoff, Marshall C. Yovits


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