∬

雙重積分

Symbol · Math symbols · U+222C

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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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