Definition from Wiktionary, the free dictionary
extremal (not comparable)
- (mathematics) Relating to extrema
2009 January, “Mathematics Calendar”, in Notices of the American Mathematical Society, volume 56, number 1, page 73:
- Tutorials provide an introduction to several major research topics in modern discrete mathematics, including probabilistic methods, extremal problems for graphs and set systems, Ramsey theory, additive number theory, combinatorial geometry, discrete harmonic analysis and more.
extremal (plural extremals)