Graphical Proof

Using the axiom set given in the articles on logical graphs, Peirce’s law may be proved in the following manner.

Reference

• Peirce, Charles Sanders (1885), “On the Algebra of Logic : A Contribution to the Philosophy of Notation”, American Journal of Mathematics 7 (1885), 180–202.  Reprinted (CP 3.359–403), (CE 5, 162–190).

Resources

• Logical Graphs • Peirce’s Law
• Logical Graphs • First Impressions
• Logical Graphs • Formal Development
• Metamath Proof Explorer • Peirce’s Axiom
• Propositional Equation Reasoning Systems

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