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A shy, neither amateur nor high-class, mathematician from Colombia.


2d
revised Banach spaces with a bounded linear functional constant on some normalized Hamel basis
Improved question title
Nov
17
reviewed Approve suggested edit on Finite number of critical points on a sphere of a polynomial?
Nov
17
asked Banach spaces with a bounded linear functional constant on some normalized Hamel basis
Nov
11
reviewed Approve suggested edit on Derivative of nuclear norm
Nov
6
revised An annoying Pell-like equation related to a binary quadratic form problem
edited title
Nov
5
reviewed Approve suggested edit on Explanation regarding statement of the Implicit Function Theorem .
Nov
4
reviewed Edit suggested edit on Why modern mathematics prefer $\sigma$-algebra to $\sigma$-ring in measure theory?
Nov
4
revised Why modern mathematics prefer $\sigma$-algebra to $\sigma$-ring in measure theory?
Just correction of a couple of typos
Nov
4
reviewed Approve suggested edit on Evaluate $\lim_{\theta\to 0}{\frac{1-2\cos\theta+\cos^2 \theta}{\theta \sin \theta}}$
Nov
4
reviewed Approve suggested edit on Derivative of an integral- Order swapping
Nov
3
reviewed Approve suggested edit on Math books tips and tricks for University students
Oct
29
reviewed Approve suggested edit on Bayes rule with discrete prior
Oct
29
reviewed Reject suggested edit on Differentiability in $f:\mathbb{R}^2 \to \mathbb{R}^2$ v/s $g:\mathbb{C} \to \mathbb{C}$
Oct
28
reviewed Reject suggested edit on What is the original function of the derivative 5x?
Oct
27
comment About integral binary quadratic forms fixed by $\operatorname{GL_2(\mathbb Z)}$ matrices of order $3$
Regarding the presentation of $\operatorname{SL_2}(\mathbb Z)$, I found this nice answer.
Oct
24
reviewed Approve suggested edit on Evaluate the limit of $\ \tan \frac{\pi \sqrt{3x-11}}{x-5}$ as $x\to 5$
Oct
23
comment Diagrams characterizing ring characteristic, and in particular field characteristic 1?
1. If $K$ is a field with characteristic $p$, then $\mathcal i:\mathbb Z/p\mathbb Z\to K$ given by $\mathcal i(\overline n)=n\cdot1_K$ is a such diagram. It is clear that this approach is completely useless to solve your second question.
Oct
23
comment Is there a simplified form of this expression?
@Stefanos $S_0=1$ by convention: note that we have $\prod_{n=1}^ka_n=a_k\prod_{n=1}^{k-1}a_n$ whenever $k\geq2$ for any $a_1,\dots,a_n$. Defining $\prod_{n=1}^0a_n$ as $1$ makes the equality also true for $k=1$.
Oct
22
reviewed Approve suggested edit on Proving a palindromic integer with an even number of digits is divisible by 11
Oct
22
reviewed Approve suggested edit on Trying to subtract 2 fractional