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161:"Note (A) for Implications for Mathematics and Its Foundations: A New Kind of Science | Online by Stephen Wolfram [Page 1151]"
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116:((φ | (ψ | χ)) | (((τ | χ) | ((φ | τ) | (φ | τ))) | (φ | (φ | ψ))))
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discovered an equally powerful and easier-to-work-with alternative:
69:((φ | (χ | ψ)) | ((τ | (τ | τ)) | ((θ | χ) | ((φ | θ) | (φ | θ)))))
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alone by using one inference rule, called "Nicod's modus ponens":
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A Reduction in the number of the
Primitive Propositions of Logic
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38:) is a formula that can be used as the sole
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147:"Nic-mp - Metamath Proof Explorer"
133:"Nic-ax - Metamath Proof Explorer"
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204:Theorems in propositional logic
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86:could be derived from this
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66:has the following form:
199:Propositional calculus
76:showed that the whole
48:propositional calculus
83:Principia Mathematica
44:semantically complete
78:propositional logic
111:Mordechaj Wajsberg
181:Works related to
96:2. (φ | (χ | ψ))
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50:. The only
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36:Jean Nicod
108:logician
29:logician
105:Polish
26:French
93:1. φ
88:axiom
74:Nicod
64:axiom
42:of a
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