Christopher Creutzig

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visits member for 4 years, 6 months
seen Jul 19 at 21:56

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