It is about countable vs uncountable not finite vs infinite

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送交者: HunHunSheng 于 2006-12-19, 16:23:08:

回答: a proper subset of a infinite set can be a infinite set itsefl. 由 steven 于 2006-12-19, 16:12:10:

In your example, both S and I are uncountable.
I is already a segment of line and S is one
saing one point so it is also a segment of line.

But it is not that many points can
copnstitiute asegment of line



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