harajm
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 Apr4 comment Every prime is maximal in a Jacobson ring? k.stm thank you! Apr3 asked Every prime is maximal in a Jacobson ring? Apr3 accepted Finding integral dependence for polynomials Apr3 asked Finding integral dependence for polynomials Mar30 comment Finding stabilizer under group action (Erlangen) Good idea, I did so. Mar30 revised Finding stabilizer under group action (Erlangen) deleted 406 characters in body Mar30 asked Similarity transformation versus Möbius transformation Mar30 asked Finding stabilizer under group action (Erlangen) Mar26 accepted Calculate area with cross ratio Mar22 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 $Cr(x,\frac{x+y}{2},y, \infty )=-1$ Mar21 revised Construct sum of points on projective line added 246 characters in body Mar21 revised Construct sum of points on projective line added 2055 characters in body Mar21 revised Construct sum of points on projective line added 2055 characters in body Mar21 asked Calculate area with cross ratio Mar21 asked Construct sum of points on projective line Feb17 awarded Popular Question Feb9 asked Erlangen approach to classical geometry Feb7 accepted Tensorproduct of $R$-module and $R$-algebra Feb7 revised Tensorproduct of $R$-module and $R$-algebra typo Feb7 awarded Custodian