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Diffstat (limited to 'src/simplify/tautology.cc')
| -rw-r--r-- | src/simplify/tautology.cc | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/src/simplify/tautology.cc b/src/simplify/tautology.cc new file mode 100644 index 0000000..d41ecd7 --- /dev/null +++ b/src/simplify/tautology.cc @@ -0,0 +1,34 @@ +/* + * richard-atp-engine: A saturation-based automated theorem prover for first-order logic. + * Copyright (C) 2026 Richard Qin + * + * This program is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <https://www.gnu.org/licenses/>. + */ + +#include "atp/simplify/tautology.h" +#include <cstddef> + + namespace atp { + bool isTautology(const Clause& clause) { + for (size_t i = 0; i < clause.size(); ++i) { + for (size_t j = i + 1; j < clause.size(); ++j) { + if (clause.literals[i].atom == clause.literals[j].atom && + clause.literals[i].is_positive != clause.literals[j].is_positive) { + return true; + } + } + } + return false; + } +}
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