|Dec10-06, 06:23 PM||#18|
Ah, I only needed the first half.
|Dec10-06, 07:57 PM||#19|
I have fixed the proof by using a collory that the empty set is a subset of everything.
But you think my proof is trivial. You are right. But for a beginner like me I want to make things rigorous even these basic things, after all it tricked me in thinking that the (proved) result was a contradiction.
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