作者raytheon694 (raytheon)
看板Math
标题[微积] 高微问题
时间Sun Jan 16 22:14:55 2011
这次考试这几题考倒我了~~~
不知道要怎麽
希望有人能帮帮我!!
(a)Is it true that int(A) ∪int(B) = int(A ∪B)??
(b) Is it true that int(A) ∩ int(B) = int(A ∩ B)??
(c) Is it true that int(cl(A)) = int(A)?
(d) Is it true that cl(A) ∩ A = A?
(e) Is it true that cl(int(A)) = A?
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