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egreg
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About

I'm a mathematician working in algebra. I've been using TeX since 1987, but couldn't write my Ph.D. thesis with it. Sob!

I teach LaTeX at my university, besides the mathematics courses. I'm the author of some LaTeX packages and even of one Plain TeX package. At my site it's possible to download my book on LaTeX programming (in Italian, sorry).

Here's my motto for TeX.SX:

Pronto prontissimo son come il fulmine: sono il factotum della città. (From "Il barbiere di Siviglia", music by Gioachino Rossini, libretto by Cesare Sterbini.)

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127
What is the antiderivative of $e^{-x^2}$
Oct 12, 2013
78
What are some examples of notation that really improved mathematics?
Nov 7, 2013
76
Why $\{\mathbf{0}\}$ has dimension zero?
Feb 5, 2014
68
Is there another way to solve $\int_{0}^{\pi}\frac{1-\sin x}{\sin x+1}dx$
Mar 17, 2015
59
A multiplication algorithm found in a book by Paul Erdős: how does it work?
Mar 17, 2017
58
$f(a+b)=f(a)+f(b)$ but $f$ is not linear
Oct 3, 2014
54
Why are There No "Triernions" (3-dimensional analogue of complex numbers / quaternions)?
May 13, 2016
50
How to prove that a $3 \times 3$ Magic Square must have $5$ in its middle cell?
Jan 13, 2014
50
Difference between $⊂$ and $⊆$?
Oct 2, 2018
45
If $A^2$ and $B^2$ are similar matrices, do $A$ and $B$ have to be similar?
Apr 21, 2015

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Was this question a “problem statement question”?
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