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      Lecture 17: Space Complexity, PSPACE, Savitch's Theorem
Description: Quickly reviewed last lecture. Introduced space complexity. Defined SPACE\((f(n))\), NSPACE\((f(n))\), PSPACE, and NPSPACE. Proved \(TQBF\) ∈ PSPACE, \(LADDER_\bf{DFA}\) ∈ NSPACE(\(n\)), and \(LADDER_\bf{DFA}\) ∈ SPACE(\(n^2\)).
Instructor: Prof. Michael Sipser
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            Fall
            
              2020
            
          
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