1,365 reputation
214
bio website kmlinux.fjfi.cvut.cz/…
location Prague, Czech Republic
age 26
visits member for 1 year, 6 months
seen 11 hours ago

Math PhD student at Czech Technical University in Prague and at LIAFA in Paris.

Code licence details applicable on my posts on TeX.SX.


Feb
26
comment Infinite Continued Fraction Notation
However, it is pretty confusing since $\frac{(2k+1)^2}{6}\neq\frac{(4k+2)^2}{24}$.
Feb
26
comment What is $\Bbb R^{\times}$?
However, $\mathbb{R}^*$ can be used for $\mathbb{R}\cup\{\pm\infty\}$. Some people don't like $\overline{\mathbb{R}}$ for that since for them, closure of $\mathbb{R}$ is just $\mathbb{R}$.
Feb
14
comment What's the intuition behind Pythagoras' theorem?
@Sawarnik Well, it's probably quite difficult to prove it from Euclid's axioms. However, this answer gives a nice insight into the way how PT works, which is probably more important for the OP than exact definitions and proving from axioms.
Feb
13
comment Find $f\left(A\right)$ for a polynomial function of a square matrix
@inquisitor Now it looks correct ;)
Feb
13
comment Find $f\left(A\right)$ for a polynomial function of a square matrix
@inquisitor Ok, then once you know what is determinant, you will learn what is the characteristic polynomial, and then you can understand (but probably not proof ;)) the Hamilton-Cayley Theorem. Before you have that, you can verify by hand that your matrix $A$ satisfies the relation $A^2=7A-10I$.
Feb
13
comment Find $f\left(A\right)$ for a polynomial function of a square matrix
@inquisitor Then you're wrong. Matrix multiplication is not done element-wise.
Feb
13
comment Find $f\left(A\right)$ for a polynomial function of a square matrix
Needed to add, the theorem you use is called Hamilton-Cayley Theorem, and is quite non-trivial ;)
Feb
12
comment MENSA IQ Test and rules of maths
Well, you have to remember that MENSA is just a stupid company like any other company in the world, and that IQ is defined as the ability to pass IQ tests. The correllation of IQ with intelligence is unknown.
Feb
11
comment Is $7$ the only prime followed by a cube?
@Lost1 Congratulations, you've just observed that voting system of SE is screwed globally. (Still, it seems to quite well achieve to find local maxima).
Feb
6
comment Is any norm induced by some inner product?
@TobiasKildetoft Sorry, I was a bit too short-headed.
Feb
6
answered Is any norm induced by some inner product?
Jan
15
comment How to correctly do a division using a slash?
Well, the typical convention is that $a/bc=a/(bc)$ and $a/b\cdot c=(a/b)c$. But I would rely on it.
Jan
13
revised $X$ and $1 - X$ are identically distributed
Seperated two math blocks by some text to incread readability.
Jan
13
suggested suggested edit on $X$ and $1 - X$ are identically distributed
Jan
13
awarded  Cleanup
Jan
13
revised Solve $12x\equiv9\pmod{15}$
rolled back to a previous revision
Jan
13
comment Integration $1/x$ - complex number
@HenningMakholm That's ridiculous, but you are probably right.
Jan
13
comment Solve $12x\equiv9\pmod{15}$
Lol, this looks like we have the very same idea :)
Jan
13
answered Solve $12x\equiv9\pmod{15}$
Jan
13
comment Integration $1/x$ - complex number
Since when the indefinite integral of a real function is a complex function, please?