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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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[50] We use "always" as meaning "in all cases," not "at all times." A similar remark applies to "sometimes."

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

*9. EXTENSION OF THE THEORY OF DEDUCTION FROM LOWER TO HIGHER TYPES OF PROPOSITIONS. *10. THEORY OF PROPOSITIONS CONTAINING ONE APPARENT VARIABLE.