Łukasz Niemier
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 Dec 11 awarded Popular Question Sep 4 comment Why do both sine and cosine exist? For those who doesn't understand @Jay joke en.wikipedia.org/wiki/Newspeak Sep 1 comment Why do both sine and cosine exist? Why we have substraction when it is just summation with different sign. Why we have division when it is just multiplication by inverse and so on. It is just simplification of notation. Feb 15 comment Is there a size of rectangle that retains its ratio when it's folded in half? Yes. It solves a big problem: printing documents (or images) scaled up or down to different paper size. Good luck with US letter. BTW check out NumberHub video about paper sizes where it is explained quite good. Dec 19 awarded Constituent Dec 19 awarded Caucus Oct 19 awarded Notable Question May 25 comment Is a proof still valid if only the writer understands it? "You do not really understand something unless you can explain it to your grandmother." May 13 awarded Caucus May 5 awarded Popular Question Feb 22 awarded Excavator Feb 22 revised Do We Need the Digits of $\pi$? Fix link to the Wikipedia to working one Feb 22 suggested approved edit on Do We Need the Digits of $\pi$? Jan 9 awarded Autobiographer Jan 7 awarded Announcer Jan 6 accepted $\mathbb{R}$ isn't group with operation $\circ$ but $\mathbb{R}\setminus \{p\}$ is, find $p$ Jan 6 asked $\mathbb{R}$ isn't group with operation $\circ$ but $\mathbb{R}\setminus \{p\}$ is, find $p$ Nov 28 accepted What am I doing wrong in calculating this determinant? Nov 28 asked What am I doing wrong in calculating this determinant? Nov 15 awarded Announcer