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merge: merge branch 'main' into solutions-removed
2 parents 79bb1f9 + 359b37f commit 16c16a5

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notes.cls

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\newcommand\mathe{\mathrm{e}} % 自然对数的底数 e
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\newcommand\mathi{\mathrm{i}} % 虚数单位 i
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\newcommand\D[1]{\mathrm{d}{#1}} % 微分算子 d
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\newcommand\sa[1]{\mathrm{Sa}{#1}} % Sa 函数
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\newcommand\sa[1]{\mathrm{Sa}{#1}} % Sa 函数
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\newcommand\sgn[1]{\mathrm{sgn}(#1)} % 符号函数
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\newcommand\ip[2]{\left\langle#1, #2\right\rangle} % 内积
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\newcommand\re[1]{\mathrm{Re}{#1}} % 实部

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