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Tqbf - Why is TQBF in PSPACE?
Answer
A formula's evaluation space grows in direct proportion to the logarithm of the number of variables if quantifiers are not included. Being fully quantified in the original QBF, it may be assumed that there are equal numbers of variables and quantifiers. It follows that the TQBF language is PSPACE difficult since this technique uses O(n + log n) = O(n) space.
