Proving that a Set is Countable

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Good demonstration, one of the best I found that actually used a function for once -- but I find it baffling just how many videos do not make an attempt to write a formal proof for their demonstrations, which is where the real meat of the subject is..

TrojenMonkey
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Thank you so very much for this very clear explanation.

valeriereid
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I don't understand why in every Prove of rational is countable they say that we needs to find a function fro N to Q bijective
Why not the opposite..from Q to N?

kato-mp