Rule of Material Implication/Definition/Historical Note
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Historical Note on Rule of Material Implication as a Definition
The Rule of Material Implication as a definition appears in the introductory material of 1910: Alfred North Whitehead and Bertrand Russell: Principia Mathematica: Volume $\text { 1 }$, and some other authors follow their lead.
Sources
- 1910: Alfred North Whitehead and Bertrand Russell: Principia Mathematica: Volume $\text { 1 }$ ... (previous) ... (next): Chapter $\text{I}$: Preliminary Explanations of Ideas and Notations