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Open formula

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An open formula is a formula that contains at least one free variable.[citation needed] Some educational resources use the term "open sentence",[1][unreliable source?] but this use conflicts with the definition of "sentence" as a formula that does not contain any free variables.

An open formula cannot have a thruth value assigned to it, in contrast with a closed formula which constitutes a proposition and thus can have a truth value like true or false.

See also

References and notes

  1. ^ http://mathforum.org/library/drmath/view/53280.html


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