Isaac Solomon
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 Mar6 comment What decides if a Coxeter Group is “crystalline” or “non-crystalline”? How much math do you know? Mar3 answered Relation between Variety of $(I\cap J)$ and Variety of $(I)$ $\cap$ Variety of $(J)$ Feb28 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 $\operatorname{Spec}(\mathbb{Q})$. Feb13 answered On the rank inequality $\operatorname{rank}(A)+\operatorname{rank}(A^3)\geq2\operatorname{rank}(A^2)$ Feb13 comment Find an example for norm of matrix. Not numbers, Janko. Number! The matrix $(1)$. Feb13 comment Find an example for norm of matrix. Can you just take the trivial example of a matrix consisting solely of the number $1$? Feb13 answered If I have an integral equality and then I multiply a variable inside the integral, does the equality still hold? Jan25 answered Show that $(\mathcal{M},d)$ is complete metric space Jan12 awarded Nice Answer Dec8 awarded Caucus Dec1 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. Nov27 comment Topological , Homeomorphic version of $|S \times S|=|S|$ You can let $A$ be a single element. Nov26 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 Nov20 answered To prove , if Aut$(G)$ is trivial then $x^2=e , \forall x \in G$ Nov20 revised Why is it hard to prove Jordan Curve Theorem in the case of Koch snowflake added 209 characters in body Nov20 answered Why is it hard to prove Jordan Curve Theorem in the case of Koch snowflake Oct25 answered Which of the ordered field axioms fail for the irrational numbers? Oct25 answered Can we define a binary operation on $\mathbb Z$ to make it a vector space over $\mathbb Q$? Oct13 answered Borel Sets which are not intervals Oct4 comment CWM book,ends,category theory,natural transformation Can you format this please?