examples/api/java/UnsatCores.java


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/******************************************************************************
 * Top contributors (to current version):
 *   Andres Noetzli
 *
 * This file is part of the cvc5 project.
 *
 * Copyright (c) 2009-2021 by the authors listed in the file AUTHORS
 * in the top-level source directory and their institutional affiliations.
 * All rights reserved.  See the file COPYING in the top-level source
 * directory for licensing information.
 * ****************************************************************************
 *
 * An example of interacting with unsat cores using CVC4's Java API.
 */

import io.github.cvc5.api.*;
import java.util.Arrays;

public class UnsatCores
{
  public static void main(String[] args) throws CVC5ApiException
  {
    try (Solver solver = new Solver())
    {
      // Enable the production of unsat cores
      solver.setOption("produce-unsat-cores", "true");

      Sort boolSort = solver.getBooleanSort();
      Term a = solver.mkConst(boolSort, "A");
      Term b = solver.mkConst(boolSort, "B");

      // A ^ B
      solver.assertFormula(solver.mkTerm(Kind.AND, a, b));
      // ~(A v B)
      solver.assertFormula(solver.mkTerm(Kind.NOT, solver.mkTerm(Kind.OR, a, b)));

      Result res = solver.checkSat(); // result is unsat

      // Retrieve the unsat core
      Term[] unsatCore = solver.getUnsatCore();

      // Print the unsat core
      System.out.println("Unsat Core: " + Arrays.asList(unsatCore));

      // Iterate over expressions in the unsat core.
      System.out.println("--- Unsat Core ---");
      for (Term e : unsatCore)
      {
        System.out.println(e);
      }
    }
  }
}