Researchers have solved a long-standing problem in topology by helping classify four-dimensional shapes (4-manifolds) that ...

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 ...

Four-dimensional optics is a research area investigating light scattering from structures which change in time and space. It holds immense promise for advancing microwave and optical technologies ...

NASA and SpaceX late Monday said they were standing down the launch of the SPHEREx and PUNCH spacecraft missions due to unfavorable weather at the launch site and an issue with one of the spacecrafts.