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Noun
1. propositional (sentential) function
Wikipedia definition
2. Propositional functionA propositional function in logic, is a statement expressed in a way that would assume the value of true or false, except that within the statement is a variable (x) that is not defined or specified, which leaves the statement undetermined. Of course, x could also consist of several variables. As a mathematical function, A(x) or A(x1, x2, · · ·, xn), the propositional function is abstracted from predicates or propositional forms. As an example, let's imagine the predicate, "x is hot".
Read “Propositional function” on English Wikipedia
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