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visits member for 2 years, 10 months
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Sep
8
answered differential equation, chain rule problem
Aug
17
answered Equations of a projective variety from parametric ones
Jul
31
answered Do two points determine a unique line in 4D space?
Jun
8
awarded  Tumbleweed
Jun
1
asked Function fields for genus 2 curves
Apr
7
awarded  Popular Question
Mar
15
comment Interior product of differential forms
Contracting with $X$ in the first argument, is by definition the interior product. A 2-form $\omega$ takes two vector fields and produces a function. One way of writing this would be $\omega(-,-)$. If you want to get rid of one of the arguments, you take a vector field that you like, $X$ and put it in one of the arguments, which we choose to be the first one, and write $\omega(X,-)$. This fixes one of the arguments and now your freedom has been reduced to insert only one vector field, i.e you now get a one-form. This is exactly the interior product and what I've done above.
Mar
15
answered Interior product of differential forms
Feb
23
awarded  Popular Question
Feb
1
awarded  Yearling
Jan
26
awarded  Commentator
Jan
26
comment Problem related with cross ratio in complex analysis
I get $7+i$ as well. Probably a typo in the problem.
Sep
5
answered Summation of $\cos A+\cos(A+B)+ \ldots \cos(A+(n-1)B)$
Apr
21
comment calculating the residue for the following complex function
Are you familiar with the formula for the residue around a pole of order n? Plug your formula and singularity in the formula given over here en.wikipedia.org/wiki/…. I haven't done the calculation but it seems like it should go through without any problems. If you're using this correctly and still not getting the correct answer maybe show us the details of your work?
Apr
14
answered Regarding the definition of covariant derivative and its use on basis vector fields
Feb
8
revised 2-sphere union with unit 2-cell is homotopy equivalent to one point union of two 2-spheres.
Mistake made
Feb
8
suggested approved edit on 2-sphere union with unit 2-cell is homotopy equivalent to one point union of two 2-spheres.
Feb
5
answered rewrite $2ie^{i\pi}+i^3$
Feb
5
answered Improving one's calculation skills
Feb
1
awarded  Yearling