Math forum-algorithm questions

Nico

Not a cfd question, but cfd user/developer might have answers: I am looking for an active math forum (similar to this forum) where i could get comments/answers about the following 2 questions:

1)About Short path algorithm with time dependent edge length algorithm; research in this subject seems to be active, i am looking to implement it in a program so i am looking for something simple enough, any ideas? (links, libraries, description)?

2)I am looking for an algorithm to offset curves (polynomial, or b-splines), mainly using a constant radius, but variable radius would be interesting.

Thanks a lot,

Nico