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Aug
5
awarded  Notable Question
Aug
4
awarded  Yearling
Jun
22
awarded  Nice Answer
Mar
6
comment What decides if a Coxeter Group is “crystalline” or “non-crystalline”?
How much math do you know?
Mar
3
answered Relation between Variety of $(I\cap J)$ and Variety of $(I)$ $\cap$ Variety of $(J)$
Feb
28
comment What about $\mathrm{Spec}(\mathbf{Q})$?
Well, it's not quite trivial. As a scheme it has a single point corresponding to the prime $(0)$, but a scheme is more than a set and a topology. It also comes with a ring of global functions, in this case $\mathbb{Q}$. Also, it is often useful in AG to consider maps to a "point". For rings lying over $\mathbb{Q}$, this is $\operatorname{Spec}(\mathbb{Q})$.
Feb
13
answered On the rank inequality $\operatorname{rank}(A)+\operatorname{rank}(A^3)\geq2\operatorname{rank}(A^2)$
Feb
13
comment Find an example for norm of matrix.
Not numbers, Janko. Number! The matrix $(1)$.
Feb
13
comment Find an example for norm of matrix.
Can you just take the trivial example of a matrix consisting solely of the number $1$?
Feb
13
answered If I have an integral equality and then I multiply a variable inside the integral, does the equality still hold?
Jan
25
answered Show that $(\mathcal{M},d)$ is complete metric space
Jan
12
awarded  Nice Answer
Dec
8
awarded  Caucus
Dec
1
comment Why are $n$-ary function symbols interpreted as $n$-ary operations and not general $n$-ary functions?
What would this accomplish? You can get away with the same thing by interpreting a relation that defines the appropriate subsets, but in general it is cleaner to not have worry about specifying the appropriate subsets.
Nov
27
comment Topological , Homeomorphic version of $|S \times S|=|S| $
You can let $A$ be a single element.
Nov
26
comment $t$-adic topology (on $\mathbb F_p(1/t)$)
The $p$-adics and their topology are a special case of ring completions and the Krull topology. I suspect this is as well, simply by choosing the appropriate ideal. en.wikipedia.org/wiki/Completion_%28ring_theory%29
Nov
20
answered To prove , if Aut$ (G)$ is trivial then $x^2=e , \forall x \in G$
Nov
20
revised Why is it hard to prove Jordan Curve Theorem in the case of Koch snowflake
added 209 characters in body
Nov
20
answered Why is it hard to prove Jordan Curve Theorem in the case of Koch snowflake
Oct
25
answered Which of the ordered field axioms fail for the irrational numbers?