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bio website provemeright.wordpress.com
location Israel
age 30
visits member for 4 years, 4 months
seen yesterday

I am a Math student (and always will be). Interested mainly in algebra, but happy to work in other areas as well.


1d
reviewed Approve Given a list of integers between $0$ and $99$, create a function that will fit all the integers in the list.
Jan
28
answered Semisimple module example
Jan
27
comment The Galois correspondence on finite extensions
You should start by reading planetmath.org/infinitegaloistheory
Jan
27
comment Group $G$ s.t. $x^5y^3=x^8y^5=e$
what have you tried so far? did you try to find other relations on x,y?
Jan
26
revised Two question about ${\mathbb Q}(\alpha)$ for $\alpha$ := $\sqrt[n]{7}$ + $\sqrt[n+3]{7}$
added 29 characters in body
Jan
26
answered Two question about ${\mathbb Q}(\alpha)$ for $\alpha$ := $\sqrt[n]{7}$ + $\sqrt[n+3]{7}$
Jan
26
comment Radius of convergence of $\sum_{n=0}^\infty a_n z^{n^2}$
For any positive number (note that you forgot the absolute value in your limit), you have that $lim a^n$ is either 0 (for $a<1$) , 1 (for $a=1$) and infinity (for $a>1$).
Jan
26
comment Radius of convergence of $\sum_{n=0}^\infty a_n z^{n^2}$
For $z=1$ can you compute the limit? what about $z=\sqrt{3}$ and $z=3$?
Jan
15
awarded  Enlightened
Jan
15
awarded  Nice Answer
Jan
14
asked congruence by integral matrices
Jan
4
comment Find the field of fractions and the integral closure of a subring of $\mathbb Z[x]$.
@algor207 I might have been a little bit ambiguous. I meant that if you assume that the ring R is generated by 1 and f, then the map $\phi$ that you defined in your original question is onto, but as you said, using degree considerations, there cannot be such a map.
Jan
3
comment Find the field of fractions and the integral closure of a subring of $\mathbb Z[x]$.
@algor207 If you assume that R can be generated by 1 and f, then the map you defined must be onto. The ring $\mathbb{Z}[x^2]$ on the other hand is generated by 1 and a single polynomial $x^2$.
Jan
2
answered Find the field of fractions and the integral closure of a subring of $\mathbb Z[x]$.
Dec
31
comment how to determine the outward pointing normal (gauss divergence theorem)
@Ozwurld The normal for $S_2$ should have positive z coordinate if you want it to point outward (from the object).
Dec
30
comment how to determine the outward pointing normal (gauss divergence theorem)
Not exactly. An outward means that if you move a little bit in the direction of the vector, you will leave the object. It doesn't mean that the entire object is in the other direction (as it is in this case). For example consider a ball of radius 2 and then take out a ball of radius 1 and look at the normal outward (from the object) at point (1,0,0).
Dec
30
comment torsion free RG-module
Do you have any conditions on $N$, since otherwise $M/N$ is just an arbitrary $RG$ module.
Dec
30
answered how to determine the outward pointing normal (gauss divergence theorem)
Dec
17
awarded  Caucus
Sep
25
awarded  Yearling