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单词
definite quadratic form
释义
definite quadratic form
noun
:
a quadratic form that is always positive or always negative for every set of values of the variables involved in it except when all the variables are zero in which case the form has the value zero
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never-never country
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nevile and winther's acid
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nevyanskite
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New
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new age music
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更新时间:2026/1/19 14:52:44