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Sep
24 |
awarded | Autobiographer |
Mar
8 |
awarded | Good Answer |
Feb
10 |
awarded | Enthusiast |
Oct
24 |
awarded | Nice Answer |
Oct
23 |
answered | Most helpful math resources on the web |
Oct
23 |
comment |
Dyck paths on rectangles
No? Take the rectangle, rotate it 45 degrees clockwise so that the diagonal becomes the x-axis, then reflect it in the x-axis. |
Oct
23 |
comment |
Placing checkers with some restrictions
Ah, yes. It can probably be fixed, somehow. |
Oct
23 |
answered | Dyck paths on rectangles |
Oct
23 |
awarded | Editor |
Oct
23 |
revised |
Placing checkers with some restrictions
Added a sketch of the bijection |
Oct
22 |
answered | Placing checkers with some restrictions |
Oct
22 |
answered | Why is it so cool to square numbers (in terms of finding the standard deviation)? |
Oct
22 |
comment |
Why is it so cool to square numbers (in terms of finding the standard deviation)?
Ilya seems to have confused variance and standard deviation. The variance of the sum of independent random variables is the sum of the variances: Var(X+Y)=Var(X)+Var(Y) so StdDev(X+Y)=sqrt(Var(X)+Var(Y)), which in general is not equal to StdDev(X)+StdDev(Y) |
Oct
21 |
awarded | Supporter |
Oct
21 |
comment |
Pairs of shortest paths
See David Speyer's answer, who was actually worked through the details! |
Oct
21 |
awarded | Teacher |
Oct
21 |
answered | Pairs of shortest paths |