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729
bio website math.stackexchange.com/users/…
location Antarctica
age 79
visits member for 2 years, 2 months
seen Dec 16 at 5:42

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


Mar
22
comment Reference request for practicing integration
@amWhy So if cost wasn't an issue, you would suggest Zwillinger's book?
Mar
22
comment Discretization of Inhomogeneous Dirichlet Boundary Conditions for 2D Poisson's Equations
@Kaster I've been meaning to get back to you. I've been quite busy, but as soon as I can, I'll post it!
Mar
18
comment Generating function: number of partitions that add up to at most $n$
Yeah, I meant product. I don't understand why that changes the number of partitions of the integer $n$ to number of partitions that add up to at most $n$. I guess I don't understand the convolution part. The only time I've been introduced to that was in differential equations.
Mar
18
comment Generating function: number of partitions that add up to at most $n$
Is it just $f\cdot g?$ I don't understand why it is if this is the case.
Mar
18
comment Combinatorial proof involving partitions and generating functions
@BrianM.Scott Okay, so I think I get your solution, but I'm not entirely convinced (my lack of understanding). When you say every partition of $r$ can be extended uniquely, that doesn't mean it's the only way to do so right? Because I could, in some haphazard manner, just throw the $r+k$ dots on to the right side of the current partition of $r$.
Mar
15
comment Proofs that every mathematician should know?
Where are all the fundamental theorems to this fundamental list? :P Not that I'm one to say anything.
Mar
14
comment Discretization of Inhomogeneous Dirichlet Boundary Conditions for 2D Poisson's Equations
That's what I thought! But the notes I have say the mass matrix, $A$, should be a size $25\times25$ matrix, but only consisting of 5-point stencil, not any of the values you have in orange/beige. Hence my confusion.
Mar
14
comment Discretization of Inhomogeneous Dirichlet Boundary Conditions for 2D Poisson's Equations
BTW, what did you use to create the diagrams?
Mar
14
comment What was the first bit of mathematics that made you realize that math is beautiful? (For children's book)
Is there some sort of repository of these mental math tricks? I'd love to see more of this stuff
Mar
11
comment Uniformly Most Powerful Test and Rejection Region of Poisson Distribution
This question seems more suitable for Cross-Validated (you might have better luck there). Just an FYI.
Mar
10
comment Further clarification needed on proof invovling generating functions and partitions (or alternative proof)
How is one supposed to realize that it is to make sense for $n \leq 2^m$? Its sort of misleading o.w. since the dots indicate it goes on forever.
Feb
27
comment Grad degree that mainly deals with probability/game theory/optimization?
Would it really be more beneficial (both in my preparation for such a program, and getting in to one) to strengthen my knowledge in probability, analysis, and linear algebra than take OR related courses? I figured if I did the former, there would be no way other way to show that I have interest in the subject.
Feb
27
comment Grad degree that mainly deals with probability/game theory/optimization?
Hi Mike, I know this was posted a long time ago, but I happened to come across this as I was interested in optimization. I too was thinking of taking some optimization and algorithms courses prior to applying to some programs. My logic for taking these courses was that I needed some way to show them I was interested in the subject (research wouldn't be possible as I'd be a non-degree student). But then I came across your post and you said it would be more useful to know algebra, analysis and probability. (see below)...
Feb
19
comment Finding the coefficient of $x^{25}$ in $(1 + x^3 + x^8)^{10}$?
How does the 10 play a role?
Feb
19
comment Finding the coefficient of $x^{25}$ in $(1 + x^3 + x^8)^{10}$?
@rlgordonma Thanks
Feb
16
comment Finding coefficient of generating function
Awesome. That confirms my solution :)
Feb
15
comment Elementary Generating Function Models
Could you explain why the coefficient of $x^{20}$ is $\binom{50}{20}5^{20}$. Specifically, why you it's $5$ that is raised to the power of $20$.
Feb
15
comment Elementary Generating Function Models
@joriki Yeah, I initially put the abbreviations there to address that issue, but I now realize that the abbreviations don't help much either. Thanks.
Feb
12
comment Combinatorial proof. What is this question asking?
@DouglasS.Stones Yeah, I knew that, but I didn't know what was being indexed. At least it wasn't apparent to me.
Feb
9
comment Combinatorial proof involving factorials
Would it have been possible to use the identity if you hadn't changed the index of $k$? I'm not sure I would be able to spot something so subtle.