Vandell
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 May 26 awarded Popular Question Jul 15 accepted What's $P$ and what's $Q$ in this classic proof of the irrationality of $\sqrt 2$? Jul 15 asked What's $P$ and what's $Q$ in this classic proof of the irrationality of $\sqrt 2$? Mar 20 accepted Find the demonstration error for the statement “All positive integers are equal” Mar 20 awarded Editor Mar 20 revised Find the demonstration error for the statement “All positive integers are equal” edited body Mar 20 asked Find the demonstration error for the statement “All positive integers are equal” Mar 17 awarded Supporter Sep 1 awarded Scholar Sep 1 accepted Canonical to Parametric, Ellipse Equation Sep 1 comment Canonical to Parametric, Ellipse Equation I'm doing this for myself, I'm revising some geometry and linear algebra to better understand some concepts in Computer Graphics. But I had pretty rigorous math teachers on my first semesters, so I got this "fear" of doing wrong things. Thank you for you enlightening explanations. Sep 1 comment Canonical to Parametric, Ellipse Equation I was thinking in make some supositions to hold my equatios, I think that it's clear now, I can accept this fact now ^^. Thank you very much. Sep 1 awarded Student Sep 1 comment Canonical to Parametric, Ellipse Equation @Thijs Laarhoven, surely. It's easy to show that with a counter example. Sep 1 comment Canonical to Parametric, Ellipse Equation @Hennig Makholm. What's the correct way to do this, I mean, without dodgy steps, because I was only able to dos this. And what do you mean "by inspection"? And finnaly, an arbitrary solution would be a (x,y) point? Thank you, you are really helping me. Aug 31 asked Canonical to Parametric, Ellipse Equation