1,102 reputation
627
bio website math.stackexchange.com/users/…
location Antarctica
age 79
visits member for 1 year, 11 months
seen Sep 17 at 4:23

Self-learning mathematics. Many thanks to those who make time to help others on the site.


Apr
23
asked Proving a complex equality
Apr
14
asked Number of matrices giving even row and column sum
Apr
14
accepted Finding a closed form expression for this sum
Apr
13
comment Finding a closed form expression for this sum
How do you know that the 2nd term is equal to $(1/\sqrt{1-4x})^2$?
Apr
13
comment Finding a closed form expression for this sum
@MarcvanLeeuwen How did you search for that? I didn't know how to search for it because there's no specific name or term associated with it. O.w. I'd just have to look through all the results one at a time.
Apr
13
asked Finding a closed form expression for this sum
Apr
11
accepted Solving functional equation for generating function
Apr
11
comment Solving functional equation for generating function
But doesn't that change the value of the sum?
Apr
11
comment Solving functional equation for generating function
Yeah, I've been trying to figure out how to get the indices to start at $0$ all day. Why is it you can just start the the indices (in your hint) at $0$?
Apr
11
asked Solving functional equation for generating function
Apr
11
comment Simplifying Catalan number recurrence relation
@BrianM.Scott In the first half of your answer, how do you go from $1+x\sum_{n\ge 0}\sum_{k=0}^nC_kC_{n-k}x^n$ to $1+x\left(\sum_{n\ge 0}C_nx^n\right)^2$
Apr
10
comment Finding functional equation for generating function
yeah, it's not a big deal. :) I was just sort of stating it as an fyi.
Apr
10
comment Finding functional equation for generating function
your solution doesn't match the solution in the text :[
Apr
10
revised Finding functional equation for generating function
added 100 characters in body
Apr
10
asked Finding functional equation for generating function
Apr
9
comment Functional equations and generating functions
oh wow...Thanks for that.
Apr
9
accepted Functional equations and generating functions
Apr
9
comment Functional equations and generating functions
okay so you used the generalized binomial theorem, then how do you get the coefficient of $x^k$ in (3)?
Apr
9
revised Functional equations and generating functions
added 4 characters in body
Apr
9
comment Functional equations and generating functions
@robjohn I was curious what rollback was. I'll change it back; I didn't edits bumped questions up. Sorry. I'm still going through your response.