It's me! ALonelyPhoenix, most of the time i go around reading math wikipedia articles, and with this account being made perhaps i could start editing some

Welp thats all, cya!

This user has been on Wikipedia for 2 years, 8 months and 19 days.

es Este usuario tiene el español como lengua materna.

None lol

Cantor's definition of two sets having the same size can be formalized as:

${\displaystyle \forall A,B:|A|=|B|\Longleftrightarrow \exists f:(\forall x\in A:\exists !y\in B:(f(x)=y))}$

Or in english: Two sets A and B are of equal size if you can make a one-to-one correspondence between each element of the two, or mathematically speaking:

${\displaystyle A\xrightarrow {f} B,f\,\,\,{\text{biyective}}}$

trigonometry!

${\displaystyle \sin(-\alpha )=-\sin(\alpha )}$ ${\displaystyle \csc(-\alpha )=-\csc(-\alpha )}$

${\displaystyle \cos(-\alpha )=\cos(\alpha )}$ ${\displaystyle \sec(-\alpha )=\sec(\alpha )}$

${\displaystyle {\text{tg}}(-\alpha )=-{\text{tg}}(\alpha )}$ ${\displaystyle {\text{ctg}}(-\alpha )=-{\text{ctg}}(\alpha )}$