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Glossary of Mathematical Mistakes
mistakes made over and over by advertisers, the media, reporters, politicians, activists, and in general many non-math people. http://www.mathmistakes.com/

information related to multigrid, multiscale, and domain decomposition methods: preprints, tutorials, codes, monthly newsletters, and a large BibTex database.

papers that explore a new point of view on the calculus, inspired by the realization that a stronger definition of the limit can banish divergence from the logical foundations of the subject.