Jimmy R
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 10h asked An example of $K(G,1)$ in Hatcher Apr14 asked Showing that the 2-torus is parallelizable Mar29 comment Two definitions of attaching are equivalent. Why not? $X\sqcup Y:=(X\times \{0\}) \cup (Y\times \{1\})$. Mar29 asked Two definitions of attaching are equivalent. Mar17 asked Why derivations obey chain rule. Mar10 comment Simplicial homology of sphere with bars. Qiaochu, if we regard $S^2$ as a subset of $\mathhbb{R}^3$, then a vertical bar is a bar inside the sphere which is parallel to the $z$-axis with vertices on $S^2$. Mar10 asked Simplicial homology of sphere with bars. Feb24 asked If $\mathbb{R}^n=U\cup V$ for path-connected $U,V$ then $U\cap V$ is path-connected. Feb23 asked When are flag manifolds compact. Jan27 asked $\sqrt{I}+\sqrt{J}=R$ implies $I+J=R$ Dec12 asked Pull-back of a one-form on a sphere. Dec2 revised A particular case of Zariski's lemma added 6 characters in body Dec2 asked A particular case of Zariski's lemma Nov5 asked Square is not an algebraic set. Nov5 asked Inverse image of a maximal ideal under a morphism of finitely generated $\mathbb{C}$-algebras. Oct18 asked $\mathbb{Q}_p$ contains a square root of $4p+1$, but not of $4p$. Oct13 comment Divisibility of polynomials in a subfield of a field. maybe I can say that the coefficients of $h$ are obtained from the coefficients of $f$ and $g$ by operations $\pm, \times, /$ and this means that these coefficients have to be in $K$? Oct13 asked Divisibility of polynomials in a subfield of a field. Oct3 comment Techniques to understand mathematics. What and how? as little as I have learnt, quite a substantial part of it was through talking to people who do mathematics Oct1 accepted The derivative as a linear function