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 10 months and 11 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!

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

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

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