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  2. First-order logic - Wikipedia

    en.wikipedia.org/wiki/First-order_logic

    P n 0, P n 1, P n 2, P n 3, ... For every integer n ≥ 0, there are infinitely many n-ary function symbols: f n 0, f n 1, f n 2, f n 3, ... When the arity of a predicate symbol or function symbol is clear from context, the superscript n is often omitted. In this traditional approach, there is only one language of first-order logic. [13]