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  • 18 votes cast
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 $\cos^3 x - 2 \cos (x) \sin^2(x) = {1\over4}(\cos(x) + 3\cos(3x))$?