yoyostein
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 Nov 10 comment Recommended Book for Open Book Exam (Algebraic Topology) @NajibIdrissi I still have one month to the exam Nov 10 asked Recommended Book for Open Book Exam (Algebraic Topology) Nov 9 comment Proof that finite group contains an element of prime order @MorganRodgers oh... Yes, you are right! Serious misunderstanding on my part.. Nov 9 comment Proof that finite group contains an element of prime order Consider $G=\mathbb{Z}_6$, the additive cyclic group. Choose $p=3$, $g=3$, the $g^{(6/3)}=3+3=0$, with order 1! I believe this is a counter example to the proof. The theorem you are trying to proof is correct, but the proof is not.. Nov 9 comment Proof that finite group contains an element of prime order @MorganRodgers in the proof it seems to work for any $p$, which is cauchy's theorem? Nov 9 comment Symmetric relation definition - why is this false? Another "paradox" to test your understanding on equivalence relations: does symmetry and transitivity together imply reflexivity? If you can see that the answer is no, you have grasped the essence. Nov 9 comment Proof that finite group contains an element of prime order I think that Aloysius' answer is correct, surprised at all the downvotes Nov 7 comment Shows that some surds cannot satisfy this equation @Lubin thanks, is there a way by showing degrees 1 and 2 are not possible? I can show degree 1 is not possible, but stuck with degree 2 (the question above) Nov 7 revised Shows that some surds cannot satisfy this equation added 29 characters in body Nov 7 asked Shows that some surds cannot satisfy this equation Nov 7 accepted “Independence” of surds Nov 7 asked “Independence” of surds Nov 7 comment Irreducible implies minimal polynomial? This has cleared my doubts. Thanks! Nov 7 accepted Irreducible implies minimal polynomial? Nov 7 asked Irreducible implies minimal polynomial? Nov 7 comment What is an intuitive explanation to why elimination retains solution to the original system of equations? I think a basic principle at work here is adding/subtracting the same thing from both sides of the equation preserves equality Nov 6 comment Composition of boundary homomorphism from Hatcher +1, I face the same problem. I have two questions, how do we get $j-1$ power for the second summation, and what happens to the $i=j$ term? Nov 5 accepted Infinite Discrete Form of Jensen's Inequality Nov 5 comment infinity over infinity and zero multiplied infinity in a calculation which gives (correctly) 1 In some parts of analysis, notably measure theory, 0 times infinity is defined to be zero. Nov 5 asked Infinite Discrete Form of Jensen's Inequality