JuliaLang/julia — pull request #1373 by simonbyrne (2012-10-13 10:15:22+00:00)
Title: Add Woodbury determinant

This adds a `det` method for the `Woodbury` matrix type using the [matrix determinant lemma](http://en.wikipedia.org/wiki/Matrix_determinant_lemma). Also fixes a problem with `LUTridiagonal` determinants. Includes tests.