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  • 108 votes cast
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?