设A、B、C、D是集合,f是A到B的双射,g是C到D的双射,令h:A×CB×D且∈A设A、B、C、D是集合,f是A到B的双射,g是C到D的双射,令h:A×CB×D且∈A×C,h()=.证明h是双射,
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![设A、B、C、D是集合,f是A到B的双射,g是C到D的双射,令h:A×CB×D且∈A设A、B、C、D是集合,f是A到B的双射,g是C到D的双射,令h:A×CB×D且∈A×C,h()=.证明h是双射,](/uploads/image/z/8496244-28-4.jpg?t=%E8%AE%BEA%E3%80%81B%E3%80%81C%E3%80%81D%E6%98%AF%E9%9B%86%E5%90%88%2Cf%E6%98%AFA%E5%88%B0B%E7%9A%84%E5%8F%8C%E5%B0%84%2Cg%E6%98%AFC%E5%88%B0D%E7%9A%84%E5%8F%8C%E5%B0%84%2C%E4%BB%A4h%EF%BC%9AA%C3%97C%26%2361614%3BB%C3%97D%E4%B8%94%26%2361474%3B%E2%88%88A%E8%AE%BEA%E3%80%81B%E3%80%81C%E3%80%81D%E6%98%AF%E9%9B%86%E5%90%88%2Cf%E6%98%AFA%E5%88%B0B%E7%9A%84%E5%8F%8C%E5%B0%84%2Cg%E6%98%AFC%E5%88%B0D%E7%9A%84%E5%8F%8C%E5%B0%84%2C%E4%BB%A4h%EF%BC%9AA%C3%97C%26%2361614%3BB%C3%97D%E4%B8%94%26%2361474%3B%E2%88%88A%C3%97C%2Ch%28%29%EF%BC%9D.%E8%AF%81%E6%98%8Eh%E6%98%AF%E5%8F%8C%E5%B0%84%2C)
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