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Closure Properties and Characterizations of TotP

P. 15–24.
Ivanashev Y.

The class TotP consists of functions that count the number of all paths of a nondeterministic polynomial-time Turing machine. In this paper, we give a predicate based definition of TotP, analogous to a standard definition of #P. From a new characterization of TotP it follows that many well known #P problems belong to TotP, and TotP = #P if and only if P = NP. We show that TotP has several closure properties of #P and GapP, and also properties that are not known to hold for #P and GapP. We also prove that the closure of TotP under left composition with FP+ is equivalent to TotP = FP+ and P = PP, and give examples of FP+-functions such that if TotP is closed under composition with them, then it is closed under composition with FP+.

Language: English
DOI
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Keywords: computational complexitycounting problemsclosure properties#P

In book

19th Annual Conference, TAMC 2025, Jinan, China, September 19–21, 2025, Proceedings. Theory and Applications of Models of Computation. Lecture Notes in Computer Science (LNCS, volume 16084)
Vol. 16084. , Springer, 2026.
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