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A
A good way of proving that a set is countable
A quick way of recognising countable sets
B
Building examples with given properties
F
Finding subsets front page
H
How to use the continuum hypothesis
J
Just-do-it proofs
T
Transfinite induction
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Diagonal arguments
Finding an interval for rational numbers with a high denominator
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Higher dimensional analogues
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Angela, I think you missed
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covering a disc
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Only if squares are of the
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Squares?
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