Truth Tree Solver - formallogic.com
www.formallogic.com/en/truth-tree-solverTruth Tree Solver. Write a symbolic sentence in the text field below. You may add any letters with your keyboard and add special characters using the appropriate buttons. When your sentence is ready, click the "Add sentence" button to add this sentence to your set. You may add additional sentences to your set by repeating this step.
Logictools
https://logictools.org/prop.htmlTruth table solvers start running into trouble with more than 20 variables. The resolution provers are a bit better than the truth table solvers, yet much worse than the DPLL solvers. all combinations generates a set of clauses representing all possible combinations of the input variables: any such set is unsatisfiable (i.e. no values of variables can make it true).
Mathematical logic step by step online
https://calculator-online.org/mathlogicMathematical logic step by step. Use symbolic logic and logic algebra. Place brackets in expressions, given the priority of operations. Simplify logical expressions. Build a truth table for the formulas entered. Conjunctive normal form (CNF), including perfect. Disjunctive normal form (DNF), including perfect.