PSPACE

"Polynomial space" redirects here. For spaces of polynomials, see Polynomial ring.
Inclusions of complexity classes including P, NP, co-NP, BPP, P/poly, PH, and PSPACE
Unsolved problem in computer science:
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(more unsolved problems in computer science)

In computational complexity theory, PSPACE is the set of all decision problems that can be solved by a Turing machine using a polynomial amount of space.