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 Apr 20 awarded Nice Question Jan 31 awarded Nice Question Jan 25 revised Subset of vectors which removed from the set does not change the dimension made answer more complete Jan 25 answered Subset of vectors which removed from the set does not change the dimension Jan 23 revised How to generalize “Seven trees in one” to labelled/colored trees? added 78 characters in body; edited title Jan 23 comment How to generalize “Seven trees in one” to labelled/colored trees? Thanks for the remark regarding terminology, then coloring seems to be what I was thinking of. The leaves don't matter, as you can identify a c-colored leaf with a Node c Leaf Leaf Jan 23 asked How to generalize “Seven trees in one” to labelled/colored trees? Dec 23 comment Spherical bread slices area You'll find a beautiful explanation in this blog post: blog.zacharyabel.com/2012/01/spherical-surfaces-and-hat-boxes Even in the classical approach, a limit process is neede, though no integration as we use it today or coordinate geometry. Nov 18 accepted Is there a plane algebraic curve with just 3-fold rotational symmetry, but without reflection symmetry? Nov 17 comment Is there a plane algebraic curve with just 3-fold rotational symmetry, but without reflection symmetry? Thanks. The trick for achieving compactness is neat, forgot about that. It seems that if one adds high enough powers, a sufficiently general polynomial will break the additional symmetry. Any more systematic approach would be appreciated though. Galois theory sounds interesting Nov 16 asked Is there a plane algebraic curve with just 3-fold rotational symmetry, but without reflection symmetry? Aug 7 awarded Yearling Aug 3 comment Is an infinite system of (linear) equations solvable if all finite subsystems are? Just combine finitely many of the $a_i$ with coefficients ;) Better as $n^e_1a_{i_1} + \ldots + n^e_ka_{i_{k^e}}$ for $\{i_1, \ldots, i_{k^e}\} \subset I$ where all depends on $e \in E$ Aug 3 asked Is an infinite system of (linear) equations solvable if all finite subsystems are? May 31 comment Are groups with all the same Hom sets already isomorphic? Awesome! Thanks you two May 31 comment Are groups with all the same Hom sets already isomorphic? Nice - so the finitely generated case works for a counterexample as well. Thank you May 31 comment Are groups with all the same Hom sets already isomorphic? Thanks, I thought that one would need some non-finitely generated group and your counterexample elaborates this perfectly. You might also post your answer under math.stackexchange.com/questions/1148289. May 31 accepted Are groups with all the same Hom sets already isomorphic? May 31 asked Are groups with all the same Hom sets already isomorphic? Mar 13 comment Connection between algebraic geometry and complex analysis? Thannks. More than for the spaces, i am interested in the relationship between regular and holomorphic functions. When studying for example $\mathbb P^1$, can we study all meromorphic maps as regular ones?