[代數] 一些數學導論的問題!!
題目共5題
Show that card(N*N)=card(N)
Show that card(Z*Z)=card(N)
Let A,B be countable. Prove that A*B is countable
Show that 根號2+根號3 and cos30度 is algevraic.
Prove that the set N is well-ordered.
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