lvella
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 Sep 11 accepted How to know if an arc segment intercepts a circle in a sphere? Sep 10 comment How to know if an arc segment intercepts a circle in a sphere? I know this answers the first question, and this is the best answer so far, but, for the second part, in $R^4$ there is no cross product... Sep 10 comment How to know if an arc segment intercepts a circle in a sphere? By the arc being contained in a circle, I meant in any place of its internal area. What I called a "circle" is an area on the surface of the sphere, and it also has curvature following the sphere. I meant this circle to be on a non-euclidean spherical space. Sep 10 comment How to know if an arc segment intercepts a circle in a sphere? It turned out bigger than I wanted... HUEHUEBR? Sep 10 revised How to know if an arc segment intercepts a circle in a sphere? added poor drawing Sep 10 comment How to know if an arc segment intercepts a circle in a sphere? No, the circle has some other given radius. And this radius is an arc, through the surface of the sphere. So, for instance, if the center of the circle is the north pole, and its radius is 90°, so the circle is the whole northern hemisphere, and its perimeter is the equator. Sep 10 asked How to know if an arc segment intercepts a circle in a sphere? Sep 5 revised Meaning of “existence” for an uncomputable function related to the Halting Problem edited title Sep 5 comment Meaning of “existence” for an uncomputable function related to the Halting Problem @hardmath Please, give me a suggestion for the title... Sep 5 asked Meaning of “existence” for an uncomputable function related to the Halting Problem Aug 20 asked Are there any “proof schemes” for P $\neq$ NP? Aug 20 comment How to prove that $P \neq NP$ Can you elaborate on "etc! many others!"? I was going to ask the same thing myself, but I found this had already been asked (and answered). Jul 3 accepted Help finding the closed formula for a recurrent relation Jul 3 revised Help finding the closed formula for a recurrent relation deleted 4 characters in body Jul 2 comment Help finding the closed formula for a recurrent relation Some instrument? Something like limit? If so, I don't even know how to write it down... Jul 2 asked Help finding the closed formula for a recurrent relation Jul 2 awarded Curious Mar 29 comment Why $\cos^3 x - 2 \cos (x) \sin^2(x) = {1\over4}(\cos(x) + 3\cos(3x))$? It is for an assignment, but that is not the goal, I can leave the answer in the form I found it. I was just checking if I got the correct answer with Wolfram Alpha and I got this completely different answer, that I was unable to turn one into the other. Mar 29 awarded Commentator Mar 29 accepted Why $\cos^3 x - 2 \cos (x) \sin^2(x) = {1\over4}(\cos(x) + 3\cos(3x))$?