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deltux

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68 reputation
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3 Answers

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4
 recognize the sequence numbers?
1
 Is the bijection shown by commutativity?
0
 Are these sets equal?

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+2 Why $U\le A \times B$ does not imply $U=\left(A\cap U\right) \times \left( B \cap U \right)$?
+10 Is the bijection shown by commutativity?
+55 recognize the sequence numbers?

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