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Jan
16
asked What kind of geometric object is the Pauli spin matrix vector $\vec{\sigma}$?
Jan
15
comment What are the dual polyhedra of the face-centered cubic lattice?
do those things really tile 3D space?? I'd love to see a picture of that!
Jan
15
asked What are the dual polyhedra of the face-centered cubic lattice?
Jan
15
revised Non-equivalent metrics on $PSL_2(\mathbb{R})$
added 774 characters in body
Jan
15
revised density of squarefree numbers in $\mathbb{Z}$ that are 1 mod 4
Stronger title
Jan
14
comment What does it mean to solve an equation?
Sometimes people give up on solving $f(x) = 0$ and just solve $f(x) \approx 0$ and are happy
Jan
14
asked density of squarefree numbers in $\mathbb{Z}$ that are 1 mod 4
Jan
14
asked Non-equivalent metrics on $PSL_2(\mathbb{R})$
Jan
13
revised What is $\frac{1}{1+\sqrt[3]{2}}$ in $\mathbb{Q}(\sqrt[3]{2})$?
obviously the power is b^3 as the author meant to write
Jan
13
comment How do you find the value of $\sum_{r=0}^{44} \tan^2(2r+1)$?
Not exactly the same math.stackexchange.com/questions/217240/…
Jan
10
awarded  Nice Question
Jan
10
accepted What is the minimum polynomial of $x = \sqrt{2}+\sqrt{3}+\sqrt{4}+\sqrt{6} = \cot (7.5^\circ)$?
Jan
8
answered Probability of A waits B at least 10 minutes
Jan
8
answered Book recommendation for rigorous multilinear algebra , tensor analysis, manifolds.
Jan
6
accepted Prove there are infinitely many primes in $\mathbb{Z}[i]$
Jan
4
comment What is the minimum polynomial of $x = \sqrt{2}+\sqrt{3}+\sqrt{4}+\sqrt{6} = \cot (7.5^\circ)$?
the computation of the minimal polynomial is pretty mechanical... but you can still get it wrong :-) I am asking if we pick out some deeper geometric meaning or symmetric to help us understand better. In the same way roots of unity correspond to regular polygons.
Jan
4
asked What is the minimum polynomial of $x = \sqrt{2}+\sqrt{3}+\sqrt{4}+\sqrt{6} = \cot (7.5^\circ)$?
Jan
3
revised Graph Relatives for Tessellation of the Hyperbolic Plane
'moduLar' not 'modular'
Dec
30
comment calculating $(1-i\sqrt{3})^{1+i}$
This would be useful if you study the zeta function over the imaginary numbers $\zeta_{\mathbb{Z}[i]}(s)$
Dec
29
comment How to write the Adeles over $\mathbb{Q}(i)$?
@anomaly if I understand correctly than $\mathbb{Q}_5 \otimes \mathbb{Q}(i) = \mathbb{Q}_{2+i} \oplus \mathbb{Q}_{2-i}$ ? And a similar story for $p = 13 = 2^2 + 3^2$ ? The case $p = 2+i$ seems funny... it's probably not true that $\mathbb{Q}_2 \otimes \mathbb{Q}(i) = \mathbb{Q}_{1+i} \oplus \mathbb{Q}_{1-i}$