formation rules
The formation rules of a logical calculus or formal language lay down which sequences of expressions are to count as well-formed . Typically these rules are recursive in character, and contain three kinds of clauses. There will be rules defining a class of basic or atomic well-formed formulae; then rules allowing that well-formed formulae may be made out of others by specific operations. Finally there is a closure condition, or rule saying that anything not generated by the first two kinds of rule is disallowed.

Philosophy dictionary. . 2011.

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