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Jul
3
comment prove a matrix that is positive definite based on distance between balls and the radius of the balls
Sorry! I correct the typo. They should be $d_{ij}$...
Jul
3
revised prove a matrix that is positive definite based on distance between balls and the radius of the balls
added 9 characters in body
Jul
3
awarded  Yearling
Jul
3
revised prove a matrix that is positive definite based on distance between balls and the radius of the balls
added 77 characters in body
Jul
3
asked prove a matrix that is positive definite based on distance between balls and the radius of the balls
Jul
2
awarded  Curious
Apr
18
accepted uniformly continuous and bounded derivative
Apr
18
asked uniformly continuous and bounded derivative
Apr
16
comment integration in five dimensions space part two
Thank you for your answer! So you do not use Stokes formula and calculate directly?(I actually don't understand pull back) what about the first two terms $p_1dq_1+p_2dq_2$?
Apr
16
accepted integration in five dimensions space part two
Apr
16
comment Find the solution to the recurrence relation: $a_n=3a_{n-1}+1; a_0=1$
Try $n=0$, it should be 1
Apr
15
comment integration in five dimensions space
Thank you so much for your answer! I guess I need to take a look at your lectures first : )
Apr
15
revised integration in five dimensions space part three
added 2 characters in body
Apr
15
asked integration in five dimensions space part three
Apr
15
comment integration in five dimensions space
Why you set $S^1\times\{1\}$ positive and the other negative?(but not the reverse) Can we determine this by using the agreement $dp_1dp_2dq_1dq_2>0$?or this is another orientation task?
Apr
15
comment convergence of Taylor series on R
Thank you very much!
Apr
15
accepted convergence of Taylor series on R
Apr
15
comment A basic question on limit calculation
Dirichlet's test for convergence of improper integrals
Apr
15
comment any theory about determinant as a function of the elements of a matrix
It seems that someone asked this question before: math.stackexchange.com/questions/216780/…
Apr
15
comment globally defined function and restriction of a differential form
OK, now I understand your logic. Thank you very much!