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seen Dec 11 at 15:45

Dec
15
awarded  Popular Question
Dec
11
awarded  Caucus
Dec
6
comment Geometric proof for triple vector product Jacobi identity
Why is it that the skew real-valued functions must be multiples of the triple vector product?
Sep
24
asked CP(2) = SU(3)/U(2)?
Sep
23
asked SU(3) geometry, without (too much) algebra
Sep
21
awarded  Critic
Sep
21
accepted Looking for a way to solve this differential equation.
Sep
20
revised Looking for a way to solve this differential equation.
added 62 characters in body
Sep
20
asked Looking for a way to solve this differential equation.
Sep
8
comment Geometric proof for triple vector product Jacobi identity
In the link in the answer of the other question, the property of a triangle that its altitudes are concurrent is used and $A + B + C = 0$ gives the configuration of a triangle in a plane.
Sep
8
comment Geometric proof for triple vector product Jacobi identity
Ýes a duplicate. I found an idea to use the property that the cross product gives a polarity on the real projective plane, when the vectors $\lambda \vec{a}$ etc. are considered as homogeneous coordinates.
Sep
8
asked Geometric proof for triple vector product Jacobi identity
Aug
31
accepted Topological properties of the so-called “plane at infinity”.
Aug
24
accepted Klein bottle as two Möbius strips.
Aug
24
revised Klein bottle as two Möbius strips.
a more clear example
Aug
24
comment Klein bottle as two Möbius strips.
I added a picture with the same idea where you can clearly see that the two versions are mirrored versions of each other. Source: ifp.illinois.edu/~sdickson/Klein/Klein.html
Aug
24
suggested approved edit on Klein bottle as two Möbius strips.
Aug
24
comment Klein bottle as two Möbius strips.
Is it possible to change the animation into two Möbius bands with opposite "apparent handedness whatever that means"?
Aug
23
comment Klein bottle as two Möbius strips.
It beats me, sorry ...
Aug
23
comment Klein bottle as two Möbius strips.
Your answer is helpful. The Klein bottle kan be embedded into 3-space with an intersection, does that make a difference?