abstract:In mathematics, an open sentence (usually an equation or equality) is described as "open" in the sense that its truth value is meaningless until its variables are replaced with specific numbers, at which point the truth value can usually be determined (and hence the sentences are no longer regarded as "open"). These possible replacement values are assumed to range over a subset of either the real or complex numbers, depending on the equation or inequality under consideration (in applications, real numbers are usually associated also with measurement units).
N
an expression containing a free variable that can be replaced by a name to yield a sentence, as x is wise 真伪未定的命题 (Also called propositional function, sentential function)
[logic]
If fashioning an open-ended, one-sentence mission statement is all it takes top earn cy pres settlement approval in our court, we have completely eviscerated the meaning of our previously controlling case law.