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Everything about 2-satisfiability

Logic problem, AND of pairwise ORs

In computer science, 2-satisfiability, 2-SAT or just 2SAT is a computational problem of assigning values to variables, each of which has two possible values, in order to satisfy a system of constraints on pairs of variables. It is a special case of the general Boolean satisfiability problem, which can involve constraints on more than two variables, and of constraint satisfaction problems, which can allow more than two choices for the value of each variable. But in contrast to those more general problems, which are NP-complete, 2-satisfiability can be solved in polynomial time. Wikipedia →

🧭 Start here: a 6-step reading path

  1. Read the overview: 2-satisfiabilityA 5-minute orientation
  2. Skim a recent paper: Weighted Random k Satisfiability for k = 1 , 2 (r2SAT) in Discrete Hopfield Neural NetworkInfluential work since 2022
  3. Pick up a classic book: The art of computer programmingThe most-reprinted book on the subject
  4. Read the landmark paper: Improved approximation algorithms for maximum cut and satisfiability problems using semidefinite programmingCited 2,527 times
  5. Go sideways: Maximum satisfiability problemA closely related topic
  6. Go sideways: Conflict-driven clause learningA closely related topic

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