QR and Curvature Wrapup 

Two remarks about the stories we have looked at over the summer: one is about QR. I mention an inconsistency in the QR implementation done by mathematica which sometimes has strange signs in the diagonal entries of R. I use now a 1-line from scratch implementation as we teach it in school. The second remark is about the k-form curvatures: it turns out that the facet curvature is not constant zero for odd dimensional manifolds. I'm wrapping up also this note now. Pictures were taken Wednesday around noon.