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Mar
17 |
comment |
Is there a class of functions closed against differentiation besides elementary?
@Anixx For the Bessel functions, you can take any two consecutive indices, since they have recurrence identities. I.e., you can express the derivative of $I_\nu$ and $K_\nu$ in terms of $I_{\nu+1},K_{\nu+1}$ or $I_{\nu-1},K_{\nu-1}$ (in addition to $I_\nu,K_\nu$ themselves). That was unclear in my answer, sorry. The other two or three examples are already finite. |
Mar
16 |
answered | Is there a class of functions closed against differentiation besides elementary? |
Sep
4 |
comment |
How to describe a tree? (depth, degree, balance, … what else?)
@JW: In an undirected graph, degree - 1, right. Else, outdegree - indegree. From what I have seen, this term is mostly used when the trees describe some sort of process or search space. |
Sep
1 |
answered | How to describe a tree? (depth, degree, balance, … what else?) |
Feb
7 |
awarded | Supporter |
Feb
7 |
answered | calculate percentiles from a histogram |
Feb
1 |
answered | Combinatorial sequences whose ratios $a_{n+1}/a_{n}$ are integers. |
Jan
20 |
awarded | Teacher |
Jan
19 |
answered | Justifying a theory by a seemingly unrelated example |
Jan
2 |
awarded | Editor |
Jan
2 |
revised |
Counting lattice points on an n-simplex
Explained some of the points asked in comments |
Jan
1 |
answered | Counting lattice points on an n-simplex |