Which website/journal/magazine would you recommend to keep up with advances in applied mathematics? More specifically my interest are:
I am looking for a fairly high-level and broad ranging source of info.
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For multivariate/spatial interpolation (I'm interested in RBFs and meshfree methods), I see things published in SIAM Journal of Numerical Analysis, Mathematics of Computation (Math. Comp), Foundations of Computational Mathematics (FoCM), Constructive Approximation, and Journal of Approximation Theory.
Try the SIAM Review. It features Survey and Review papers of wide interest.