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Everything about IP (complexity)

Complexity class from interactive proofs

In computational complexity theory, the class IP is the class of problems solvable by an interactive proof system. It is equal to the class PSPACE. The result was established in a series of papers: the first by Lund, Karloff, Fortnow, and Nisan showed that co-NP had multiple-prover interactive proofs; and the second, by Shamir, employed their technique to establish that IP=PSPACE. The result is a famous example where the proof does not relativize. Wikipedia →

đź§­ Start here: a 6-step reading path

  1. Read the overview: IP (complexity)A 5-minute orientation
  2. Skim a recent paper: Dynamical memristors for higher-complexity neuromorphic computingInfluential work since 2022
  3. Pick up a classic book: The Conspirators HierarchyThe most-reprinted book on the subject
  4. Read the landmark paper: Bayesian Measures of Model Complexity and FitCited 10,371 times
  5. Go sideways: Heyting arithmeticA closely related topic
  6. Go sideways: Karp–Lipton theoremA closely related topic

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🗂️ The subject at a glance

  1. Definition
  2. Proof of IP = PSPACE
  3. Variants

🏆 Landmark papers (most cited)

🆕 Influential since 2022

📚 Books worth reading

Ranked by number of editions on Open Library, a rough measure of how lasting a book is.

đź”— Related topics