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Mar
25
accepted What are the 2125922464947725402112000 symmetries of a Rubik's Cube?
Mar
25
comment What are the 2125922464947725402112000 symmetries of a Rubik's Cube?
@Joriki Thank you, but doesn't that give the wrong number? The size of the Rubik's cube group is 4*10^19 (en.wikipedia.org/wiki/Rubik's_cube_group).
Mar
25
asked Is there a geometric interpretation of the exponential function of real numbers?
Mar
25
asked What are the 2125922464947725402112000 symmetries of a Rubik's Cube?
Mar
20
revised Logic question: Ant walking a cube
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Mar
20
answered Logic question: Ant walking a cube
Mar
17
accepted What am I doing when I separate the variables of a differential equation?
Mar
16
awarded  Nice Question
Mar
16
comment What am I doing when I separate the variables of a differential equation?
Thanks for the link, but the description there is not what you said. Differentials as described in Wikipedia are not infinitesimal changes.
Mar
16
comment What am I doing when I separate the variables of a differential equation?
The $dx$ and $dy$ are coming from a single limit. That's what I've been taught in calculus. This answer is logically equivalent to saying "you can do that because you can do that".
Mar
16
asked What am I doing when I separate the variables of a differential equation?
Mar
14
comment What is an intuitive explanation for $\operatorname{div} \operatorname{curl} F = 0$?
Why the down votes?
Mar
14
revised What is an intuitive explanation for $\operatorname{div} \operatorname{curl} F = 0$?
added 87 characters in body
Mar
14
revised What is an intuitive explanation for $\operatorname{div} \operatorname{curl} F = 0$?
added 5 characters in body
Mar
14
comment What is an intuitive explanation for $\operatorname{div} \operatorname{curl} F = 0$?
@Billare Thanks. Should say "I'll use Gauss's..."
Mar
14
comment What is an intuitive explanation for $\operatorname{div} \operatorname{curl} F = 0$?
@kake Right. It's not supposed to be a proof so much as a heuristic to suggest the identity might be true.
Mar
14
answered Non-traditional math concepts for early education
Mar
14
answered What is an intuitive explanation for $\operatorname{div} \operatorname{curl} F = 0$?
Mar
14
comment What is an intuitive explanation for $\operatorname{div} \operatorname{curl} F = 0$?
I like the analogy to a fluid flow, but for the divergence, were you referring to many needles converging to or diverging from a point rather than one needle? That would make more sense to me since one needle cannot change its shape or grow and shrink. I'm also wary of considering a two-dimensional fluid when the curl is defined in three.
Mar
12
awarded  Nice Question