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19h
asked Geodesic equation applied to halfplane model
May
11
accepted Calculate the pushforward of smooth map between manifolds
May
10
asked Calculate the pushforward of smooth map between manifolds
May
9
awarded  Critic
May
9
accepted Smooth chart in what sense?
May
3
asked Smooth chart in what sense?
Apr
4
comment Every prime is maximal in a Jacobson ring?
k.stm thank you!
Apr
3
asked Every prime is maximal in a Jacobson ring?
Apr
3
accepted Finding integral dependence for polynomials
Apr
3
asked Finding integral dependence for polynomials
Mar
30
comment Finding stabilizer under group action (Erlangen)
Good idea, I did so.
Mar
30
revised Finding stabilizer under group action (Erlangen)
deleted 406 characters in body
Mar
30
asked Similarity transformation versus Möbius transformation
Mar
30
asked Finding stabilizer under group action (Erlangen)
Mar
26
accepted Calculate area with cross ratio
Mar
22
comment Construct sum of points on projective line
It is true that these two is not incompatible, they are derieved from the same formula and completely symmetric, however they should not equal minus one, since this order does not describe harmonic conjugates from the geometric point of view. And also, it is the other expression that I would need for my solution to work, however I can not derive it from the formulas for cross ratio eventhough it is intuitevely clear that I should have $Cr(0,x,2x,\infty )=-1$ and $Cr(x,\frac{x+y}{2},y, \infty )=-1$
Mar
21
revised Construct sum of points on projective line
added 246 characters in body
Mar
21
revised Construct sum of points on projective line
added 2055 characters in body
Mar
21
revised Construct sum of points on projective line
added 2055 characters in body
Mar
21
asked Calculate area with cross ratio