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'New System and Explanation of New System', 'An Inquiry into Meaning and Truth' and 'Elements of Geometry'
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4. Formal Logic / C. Predicate Calculus PC / 2. Tools of Predicate Calculus / c. Derivations rules of PC
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If you pick an arbitrary triangle, things proved of it are true of all triangles [Euclid, by Lemmon]
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4. Formal Logic / C. Predicate Calculus PC / 2. Tools of Predicate Calculus / e. Existential quantifier ∃
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There are four experiences that lead us to talk of 'some' things [Russell]
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