ALonelyPhoenix

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 1 year, 1 month and 25 days.

esEste usuario tiene el español como lengua materna.

Contributions

None lol

amogus

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

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

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:

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

trigonometry!

$\sin(-\alpha )=-\sin(\alpha )$ $\csc(-\alpha )=-\csc(-\alpha )$

$\cos(-\alpha )=\cos(\alpha )$ $\sec(-\alpha )=\sec(\alpha )$

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