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Principia mathematica, vol. 1 (of 3)

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Project Gutenberg EPUB3 edition Whitehead, Alfred North and Russell, Bertrand

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[48]Philosophical works, Gerhardt's edition, Vol. VII. p. 223.

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Principia mathematica, vol. 1 (of 3), Project Gutenberg eBook #78050

*3. THE LOGICAL PRODUCT OF TWO PROPOSITIONS. *4. EQUIVALENCE AND FORMAL RULES.