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<a accesskey="3" href="page.php?w=IP_%28complexity%29&amp;p=2">3.Next</a>
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<p>In <a href="page.php?w=computational_complexity_theory">computational complexity theory</a>, the class <b>IP</b> (which stands for <b>interactive proof</b>) is the class of problems solvable by an <a href="page.php?w=interactive_proof_system">interactive proof system</a>. It is equal to the class <b><a href="page.php?w=PSPACE">PSPACE</a></b>. The result was established in a series of papers: the first by Lund, Karloff, Fortnow, and Nisan showed that <a href="page.php?w=co-NP">co-NP</a> had multiple-prover interactive proofs; and the second, by</p><p>
<a accesskey="3" href="page.php?w=IP_%28complexity%29&amp;p=2">3.Next</a>
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