∆

增量

Symbol · Math symbols · U+2206

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∀全称量词 ∁Complement ∂偏微分 ∃存在量词 ∄There Does Not Exist ∅空集 ∇向量微分 ∈是...的元素 ∉不属于 ∊Small Element Of ∋包含为成员 ∌Does Not Contain As Member ∍Small Contains As Member ∎证明完毕 ∏N元乘积 ∐N-Ary Coproduct ∑N元求和 −减号

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