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※ 發信站: 批踢踢實業坊(ptt.cc)
◆ From: 111.241.124.165
Let A,B,C,D be sets.
Prove (A ×B)-(C ×D)=[(A-C) ×B]∪[A ×(B-D)]
請各位高手幫幫我
謝謝
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