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 Jan 26 reviewed Approve A subgroup has the same number of left and right cosets - Tricks - Fraleigh p. 103 10.32, 35 Jan 25 accepted How to ensure that you haven't run into a paradox proving a theorem e.g. by proof by contradiction? Jan 24 reviewed Approve Why Q is not locally compact, connected, or path connected? Jan 24 comment How to ensure that you haven't run into a paradox proving a theorem e.g. by proof by contradiction? Thank you, looks promising! Jan 24 reviewed Approve Classifying singularity Jan 24 comment How to ensure that you haven't run into a paradox proving a theorem e.g. by proof by contradiction? @TimSeguine: But there still remains the possibility that when you assume the negation and again arrive at a contradiction that your axiom system is faulty (see Zermelo-Russell paradox), so the question remains: How to ensure that you haven't run into a paradox proving a theorem? Jan 24 asked How to ensure that you haven't run into a paradox proving a theorem e.g. by proof by contradiction? Jan 8 reviewed Approve Prove that $\lim_{n\to\infty}\left[1-\prod_{i=1}^{n} (1-\frac{a}{i} )\right]= 1$. Dec 30 awarded Custodian Dec 30 reviewed Approve Systems of linear equations to calculate $\alpha$ and $\beta$ Dec 1 awarded Notable Question Nov 25 comment How to see and proof that the hyperbola as a constant difference of distances holds for $\frac{1}{x}$? @AlexR: I edited the question - is it clearer now? Nov 25 revised How to see and proof that the hyperbola as a constant difference of distances holds for $\frac{1}{x}$? added 155 characters in body Nov 25 comment How to see and proof that the hyperbola as a constant difference of distances holds for $\frac{1}{x}$? @AlexR: I am afraid I still don't understand: What part doesn't make sense gramatically?!? Nov 25 comment How to see and proof that the hyperbola as a constant difference of distances holds for $\frac{1}{x}$? @AlexR: What exactly is unclear to you? The first part gives a definition of the hyperbola (see also link to wikipedia which is included), the second part asks the question how to prove that this def. holds for 1/x. Nov 25 asked How to see and proof that the hyperbola as a constant difference of distances holds for $\frac{1}{x}$? Nov 11 awarded Popular Question Nov 5 awarded Popular Question Nov 1 awarded Popular Question Oct 30 awarded Popular Question