글쓴이: parksoonok (나그네)
날 짜: Sun Mar 24 22:47:32 2002
제 목: 거리공간질문이에용
1. (증명)
If X and Y are nonempty sets of real numers which have upper bounds and if
X<=Y then sup x <= sup Y
2. for the metric space R prove that an "open" interval is open and that a si
ngleton, that is, a one point set, is not open.
dmdyong님 (2002/10/27)
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