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 Yearling
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Jan
21
comment Sheafs of modules on Proj S
Try to define the morphism on distiguished affine opens and show they glue
Jan
16
comment Are rings $\mathbb Q[i]$ and $\mathbb Q[\sqrt{3}i]$ isomorphic?
Is there an element in $\mathbb{Q}(\sqrt{3}i)$ that squares to -1?
Dec
30
comment Pull back of canonical line bundle under a blow up
@Mohan That works. Thanks!
Dec
30
asked Pull back of canonical line bundle under a blow up
Dec
14
awarded  Yearling
Dec
14
revised Intersection theory question from Vakil's notes on Algebraic Geometry
deleted 37 characters in body
Dec
14
asked Intersection theory question from Vakil's notes on Algebraic Geometry
Dec
3
asked Unramified cocycles and the Selmer group of an ellptic curve
Dec
2
revised Why did Euclid call 6 a perfect number?
fixed typo and added small ammounts of mathjax
Dec
2
suggested approved edit on Why did Euclid call 6 a perfect number?
Nov
22
comment Entire functions with finite $L^1$ norm must be identically $0$
consider the size of the pole at infinity. Does it then become a problem about integrating $1/|z|^n$ near zero?
Nov
15
awarded  Enthusiast
Nov
9
accepted Is multiplication by $n$ a closed map for an abelian topological group
Nov
8
asked Is multiplication by $n$ a closed map for an abelian topological group
Nov
7
comment Is term “real number” equivalent to “group of algorithms generating stream of digits”?
Is there a set of strings that describe algorithms in standard set theory?
Nov
6
comment proving $ \sqrt 2 + \sqrt 3 $ is irrational
In the proof of $\mathbb{Q}(\sqrt{2},\sqrt{3})=\mathbb{Q}(\sqrt{3}+\sqrt{2})$ you basically end up showing the desired result. I like your first proof. I am less of a fan of your sledgehammer
Nov
3
comment Are the sets connected or path-connected?
I think it is often useful to think about shapes. Try drawing pictures of $S_1$. I think whether connected/path-connected will become clear. Same goes for $S_3$. At least $S_4$ is a little subtler. Also would you mind clarifying $S_2$? I do not quite see what it is saying. What is the ambient space?
Nov
3
comment How to reconcile the fact that the antiderivative of $\sin(x)\cos(x)$ has two possible answers?
To put what Sam Weatherhog said more bluntly: those two function do differ by a constant
Nov
1
accepted Cohomology of closed subgroup of profinite group
Oct
31
comment Is $J(V)$ just the symmetric algebra of the dual of $V$?
One last thought. The above answer is just really only the fact that polynomials over infinite fields are zero if and only if they are zero on all points.