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arXiv · 2109.14745

On the independence of Robinson's set of axioms for propositional calculus

Benoît Jubin
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Abstract

We give a normal five-valued truth-table proving independence of one of the axioms in Robinson's set of axioms for propositional calculus from 1968, answering a question raised in his article, where he uses a non-normal truth-table. We also give a normal four-valued truth-table proving independence of one of the other axioms, where he uses a normal five-valued truth-table.

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Benoît Jubin. 2021-09-29. On the independence of Robinson's set of axioms for propositional calculus. https://arxiv.org/abs/2109.14745

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