if and only if是什么意思_if and only if用英语怎么说_if and only if的翻译_if and only if翻译成_if and only if的中文意思_if and only if怎么读,if and only if的读音,if and only if的用法,if and only if的例句

Positive semi - definite matrices are positive definite if and only if they are nonsingular.

正半定矩阵是正定的,当且仅当它们是非奇异矩阵.

辞典例句

Theorem 1 and are equivalent infinitesimals if and only if.

定理1与是等阶无穷小的充分必要条件为.

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Always be conscious with the if and only if conditions of a equation or a theory.

公式、等式、与理论之正确必须符合其假设条件.

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