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 Dec19 awarded Caucus Sep20 awarded Popular Question Aug1 comment Looking for a bijection between this set and natural numbers I had some time to read this through, and it was very helpful. The bijection between $A_{k, M}$ and that subset is just impressive. At the moment, I am still unable to truly understand it but I'll think harder. However, I used another method for mapping the combination to an integer, the "combinatorial number system" as described by D. Knuth. For the time being, I am satisfied with this result. Aug1 accepted Looking for a bijection between this set and natural numbers Jul20 comment Looking for a bijection between this set and natural numbers +1 Thanks. I need some time and efforts to digest this, though. Jul20 revised Looking for a bijection between this set and natural numbers added 37 characters in body Jul20 comment Looking for a bijection between this set and natural numbers Well, you aren't allowed! Sorry for not being explicit enough. They have to be integers. Jul20 comment Looking for a bijection between this set and natural numbers I do mean a closed interval. Jul20 comment Looking for a bijection between this set and natural numbers I edited my question clarifying that two points. Thanks for your time. Jul20 revised Looking for a bijection between this set and natural numbers added 353 characters in body Jul20 asked Looking for a bijection between this set and natural numbers May18 comment Designing a function No need to apologise, thank you for you help. May18 comment Designing a function I have searched for information about them and I don't feel like I am able to apply them to this scenario right away. If you write an answer, I'd be glad to read it. May18 revised Designing a function deleted 25 characters in body May18 asked Designing a function Apr9 awarded Popular Question Sep8 revised Proving inequality $(a+\frac{1}{a})^2 + (b+\frac{1}{b})^2 \geq \frac{25}{2}$ for $a+b=1$ some latex stuff Sep8 suggested approved edit on Proving inequality $(a+\frac{1}{a})^2 + (b+\frac{1}{b})^2 \geq \frac{25}{2}$ for $a+b=1$ Apr3 comment Function mapping combinations to natural numbers Thank you. Thanks to your suggestions I've managed to write a small Java library to deal with combinations. Apr3 awarded Commentator