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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
Mar
21
asked Construct sum of points on projective line
Feb
17
awarded  Popular Question
Feb
9
asked Erlangen approach to classical geometry
Feb
7
accepted Tensorproduct of $R$-module and $R$-algebra
Feb
7
revised Tensorproduct of $R$-module and $R$-algebra
typo
Feb
7
awarded  Custodian