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4. Formal Logic / C. Predicate Calculus PC / 2. Tools of Predicate Calculus / a. Symbols of PC

[meanings of the symbols used in predicate logic]

4 ideas
'Gm' says m has property G, and 'Pmn' says m has relation P to n [Lemmon]
Write '(∀x)(...)' to mean 'take any x: then...', and '(∃x)(...)' to mean 'there is an x such that....' [Lemmon]
The 'symbols' are bracket, connective, term, variable, predicate letter, reverse-E [Lemmon]
'⊃' ('if...then') is used with the definition 'Px ⊃ Qx' is short for '(Px & Qx)' [Putnam]