(UK) Synonym of agony column

(graph theory) An unsolved problem in mathematics, asking for the largest possible number of edges in a bipartite graph that has a given number of vertices and has no complete bipartite subgraphs of a given size.

(mathematics) The problem of generalizing Paul Gordan's computational approach to the theorem of the finiteness of generators for binary forms to work with functions having more than two variables.

An insignificant problem of a privileged person.

plural of Cadillac problem

(creationism, pseudoscience) The conflict between Young Earth creationism (asserting that the universe is thousands of years old) and the starlight-related measurements that show the universe to be billions of years old.

The problem of finding a concept of a taxonomic species that can be usefully applied to many very different types of organism.

plural of Fermi problem

(physics, engineering) Any estimation problem designed to teach dimensional analysis or the approximation of extreme scientific calculations: often a back-of-the-envelope problem with limited data.

plural of species problem