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 Mar 14 revised An example of an easy to understand undecidable problem added 16 characters in body May 23 revised Troll Maths : Bijection between P(N) and N? latex the examples. May 23 suggested approved edit on Troll Maths : Bijection between P(N) and N? Feb 1 revised If $f(x) = h(x)g(x)$, is $h$ differentiable if $f$ and $g$ are? make it clearer whoe is differentiable and who isn't Feb 1 suggested approved edit on If $f(x) = h(x)g(x)$, is $h$ differentiable if $f$ and $g$ are? Jan 27 comment Calculate the intersection points of two ellipses I don't understand - are the ellipses alligned, sharing a major axis? Jan 3 comment An example of an easy to understand undecidable problem @miracle173. Thanks! (btw, if I remember correctly you can add invisible html comments  to bypass the edit size limit if you need to fix typos in the future) Jan 3 revised An example of an easy to understand undecidable problem edited body Dec 15 comment Prove $2^{1/3}$ is irrational. You can't prove something starting by assuming what you want to prove. Dec 5 answered Why is there implied an equality between vectors and $n$-tuples? Dec 5 comment Help with epsilon-delta proof of continuity eps-delta is traditionally hard because it is one of the first times you encounter a statement with nested exists and for-all quantifiers. The problem is that unless you can specify a specific problem you are having I don~t think anyone here will come up with an explanation that is much better then the one in your textbook. Nov 24 revised added link (the exact more-info link is not necessarily self-descriptive) Nov 24 suggested approved edit on Nov 22 answered Complexity of sorting algorthms Nov 10 awarded Teacher Nov 10 revised An example of an easy to understand undecidable problem added 559 characters in body Nov 10 awarded Editor Nov 10 revised An example of an easy to understand undecidable problem added 559 characters in body Nov 10 answered An example of an easy to understand undecidable problem Oct 17 awarded Scholar