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因为
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· U+2235
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∀
全称量词
∁
Complement
∂
偏微分
∃
存在量词
∄
There Does Not Exist
∅
空集
∆
增量
∇
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
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