The 4-dimensional Hartmann function is multimodal. It is given here in the form of Picheny et al. (2012), having a mean of zero and a variance of one. The authors ...

A mathematical problem solved by Susanna Heikkilä relates to the classification of quasiregularly elliptic 4-manifolds, ...

The model gives a three dimensional map of part of one of the crystal salts of penicillin. The contours are lines of electron density and show the positions of individual atoms in the structure.