对其命题变元的所有真值均为真的陈述。
对其命题变元的所有真值均为真的陈述。
A statement that is true for all truth values of its propositional variables.
(逻辑)必然为真的陈述
(logic) a statement that is necessarily true
对其布尔原子所有真值均为真的陈述。
A statement that is true for all truth values of its Boolean atoms.
无用的重复
useless repetition
the statement `he is brave or he is not brave' is a tautology
“他勇敢或他不勇敢”这一陈述是同义反复
to say that something is `adequate enough' is a tautology
说某物“足够充分”是同义反复
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