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| bio | website | |
|---|---|---|
| location | ||
| age | 26 | |
| visits | member for | 1 year, 1 month |
| seen | 23 hours ago | |
| stats | profile views | 138 |
I'm currently a graduate student at University of Washington. I'm interested in combinatorics.
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May 16 |
comment |
Non-isomorphic posets I think this is what you're looking for. Only a few values are known. I would be very surprised if there was a simple formula. |
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May 6 |
awarded | Caucus |
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Apr 26 |
comment |
Inverting a convolution with a binomial coefficient Is $g(k)$ defined for $k<0$? If not then you need to specify $n \leq k$. |
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Apr 7 |
awarded | Yearling |
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Apr 1 |
comment |
Is there a rigorous theory of context, whereby sets can gain additional structure within a context? Although you seem to be more interested in algebraic contexts, Joyal's beautiful theory of combinatorial species is a possible answer for the question title. |
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Apr 1 |
comment |
Catalan number interpretation Very pretty question and solution! |
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Mar 28 |
answered | Number of even letter permutations is divisible by $p$ |
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Mar 15 |
awarded | Altruist |
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Mar 11 |
awarded | Investor |
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Mar 7 |
awarded | Good Answer |
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Mar 7 |
awarded | Nice Answer |
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Mar 7 |
comment |
How do we use derivatives in our daily lives Speedometers are pretty useful to have around... |
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Mar 7 |
answered | What was the first bit of mathematics that made you realize that math is beautiful? (For children's book) |
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Mar 7 |
comment |
Flipping coins in a chessboard It looks like you mean $f_{(a,b)} = 1$ for heads, $-1$ for tails. |
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Mar 3 |
answered | How to solve the non homogeneous equations |
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Feb 28 |
comment |
Philosophy of learning mathematics (combinatorics) For #2: The Bible of combinatorics is Richard Stanley - Enumerative Combinatorics. It has hundreds of exercises with a rating scale for difficulty. You can get Volume 1 in pdf form from Stanley's web page here. |
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Feb 26 |
comment |
How many ways to visit 6 cities twice without visiting the same city twice in a row? Do you know inclusion-exclusion? |
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Feb 19 |
answered | Combination of three items with no adjacent items the same |
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Feb 16 |
answered | Enumerating Rooted labeled trees without Langrange inversion formula |
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Feb 7 |
comment |
Counting strings containing specified appearances of words These references look helpful. Thanks. |
