Many
Smile
Home
›
Math symbols
› Double Integral
∬
二重积分
Symbol ·
Math symbols
· U+222C
∬
Copy ∬
Related
∀
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
Copied
ManySmile