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16 de jul. de 2023 · 文章浏览阅读1w次，点赞20次，收藏33次。一、Union 联合类型1、数据容器的类型注解问题2、Union 联合类型语法3、代码示例 - 普通变量设置 Union 联合类型注解4、代码示例 - 容器变量设置 Union 联合类型注解5、代码示例 - 函数中设置 Union 联合类型注解二、完整代码示例 - Union 联合类型_python union类
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3 de feb. de 2015 · 12. Let f: X → Y be a function, and let {Si: i ∈ I} be a family of subsets of X. Then, f(⋃ i ∈ ISi) = ⋃ i ∈ If(Si). The case where f(A ∪ B) = f(A) ∪ f(B) is trivial and I've proved this many times in other classes. However, I believe that the problem I am running into is with notation.
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