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Feb
22 |
awarded | Nice Answer |
Oct
8 |
awarded | Constituent |
Oct
8 |
awarded | Caucus |
Jun
25 |
awarded | Yearling |
Nov
15 |
awarded | Popular Question |
Jul
30 |
comment |
Most striking applications of category theory?
This would be an excellent example if only it were followed up with some detail and references. |
Jan
31 |
comment |
Can a polynomial size CFG describe the finite language \{$w \pi(w)$ : $\pi(w)$ is fixed string permutation, $|w|=n$ is fixed\} over alphabet \{0,1\}?
polynomial size in what? $n$? And is $n$ encoded in binary? It seems the CNF grammar is what you're seeking given the permutation $\pi$ and the length of the strings $n$. |
Jan
27 |
comment |
Nontrivial circular arguments?
Every circular proof is also a proof of equivalence. That is, the unsatisfying circular proof, using an assumption that ends up depending on the thing to be proved, is also a proof the assumption is equivalent to the conclusion (they both imply each other). The hard part is to extract from the disappointment the bidirection or circle of implication. |
Jan
14 |
answered | Equational logic |
Jan
11 |
answered | Is finitism an extreme form of constructivism? |
Jan
5 |
comment |
Computer Science for Mathematicians
Computer architecture (a la Patterson and Hennessey) as interesting and useful and having mathematical underpinnings and relevant to understanding motivations for TCS as it is, is in no way TCS and is not mathematics. |
Jan
5 |
comment |
Computer Science for Mathematicians
@Igor - I was about to say the same thing, but it certainly is a text about mathematics that is inspired by thinking about writing programs...well, those programs that Don Knuth was thinking about in 1960. |
Jan
5 |
comment |
Computer Science for Mathematicians
Intro to Automata Theory, Languages, and Computation, Hopcroft, Ullman, Motwani infolab.stanford.edu/~ullman/ialc.html is a good alternative. |
Jan
4 |
comment |
Collatz conjecture for numbers of th form $2^n +1$
If you plot the numbers, some interesting patterns emerge (mostly increasing but with scattered outliers, and longer and longer incremental sequences). A very different pattern from the usual Collatz 'number of steps' function A006577. |
Jan
4 |
comment |
Collatz conjecture for numbers of th form $2^n +1$
The sequence has been submitted to OEIS (not yet approved) with links here. |
Jan
4 |
answered | Algorithm for summing certain sums involving the floor function |
Jan
3 |
awarded | Commentator |
Jan
3 |
comment |
Unpopular “elementary” theorems/identities to impress an audience of mathematicians.
+1 simply for pointing out Marden's theorem. |
Dec
30 |
comment |
The Mystic Rose
The function given there is for equally spaced points on a circle, and links there go to explanations and formulas. One link on that OEIS page is to: oeis.org/A005732 for general position points on a circle, and gives the formula C(n+3,6)+C(n+1,5)+C(n,5) surely equivalent to a formula at your relevant blog posting. |
Dec
11 |
comment |
Is pattern recognition NP-complete?
'Pattern Recognition' seems too general a name for this problem. It sounds more like interpolation. |