# Purely mathematical questions

I think questions like this A mirror flips left and right, but not up and down (which is pure geometry) should be moved to Mathematics.

• Darn Anixx, after discrediting fundamental physics questions by saying they are metaphysics did not pan out, you are not going after physics questions that naturally involve mathematical concepts to move them away, or are you? The one you cite in this question is a perfectly good physics question. Sep 5, 2012 at 14:56
• The community here has not previously shown much interest in drawing this line very strongly. Sep 5, 2012 at 15:49
• I find the mirror question to be an odd example, since the logic could disqualify the entire optics field. Sep 5, 2012 at 16:14
• @AlanSE For that matter I find the mirror question odd as an example of a math question because the "paradox" revolves around the perception of the image as a "person" possessed of a point of view and entitled to evaluate "left" and "right" in its own frame. If you stopping attributing person-ness to the image then it becomes clear that the mirror flips in/out but not any transverse direction. Sep 5, 2012 at 16:18
• @dmckee left and right in the person's basis is a pure geometry. Sep 5, 2012 at 17:11
• @Dilaton if you do not see destinction between physics, mathematics and philosophy, it is your problem. This does not mean the destinction does not exist. Sep 5, 2012 at 17:13
• The question is stated physically, it involves real objects --- a mirror and a human, not some abstract mathematical concepts. Sep 6, 2012 at 4:47
• @Yrogirg Well if you ask how to make a gold ball with the same volume as a given gold cube, will this question be mathematical or physical? Sep 6, 2012 at 6:54
• Physical of course --- you just melt a cube into a ball. Sep 6, 2012 at 7:02
• @Yrogirg no, you are asked to create a second object, not to destroy former. Also to make a ball you have to know a radius. Sep 6, 2012 at 7:25
• As long as enough people think it is appropriate here, then it need not be moved.
– MBN
Sep 6, 2012 at 10:22
• How is this not physics? Jun 23, 2013 at 14:05