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約等於
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· U+2245
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∀
全稱量詞符號
∁
Complement
∂
偏導數符號
∃
存在量詞符號
∄
There Does Not Exist
∅
空集
∆
遞增
∇
遞減
∈
屬於
∉
不屬於
∊
Small Element Of
∋
包含
∌
Does Not Contain As Member
∍
Small Contains As Member
∎
證明完畢
∏
n 元求積
∐
N-Ary Coproduct
∑
n 元求和
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