Category Archives: reference

Symbols in Principia Mathematica

“(∃x)φx” — “There exists an x for which φx is true,” or “there exists an x satisfying φx” page 16. 1st ed. “(x)φx” — “the x which satisfies .” Page 31. 1st ed. “E!(x)φx”  — “the x satisfying φx exists”. Page … Continue reading

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