p-Adic numbers were introduced in mathematics by K. Hensel, and this invention led to substantial developments in number theory, where p-adic numbers are now as natural as ordinary real numbers. […] Bleher noticed in [19] that the set of purely fractional p-adic numbers is an example of hierarchical lattice.

Pull the plug out of the tub so it can drain.

a crush at a reception

Egg-crating can also be used to support metal molds where the thickness of the metal has been reduced to improve weight savings and costs.