Editing Hermite polynomials (section)

===Cramér's inequality===
For real {{mvar|x}}, the Hermite functions satisfy the following bound due to [[Harald Cramér]]<ref>{{harvnb|Erdélyi|Magnus|Oberhettinger|Tricomi|1955|p=207}}.</ref><ref>{{harvnb|Szegő|1955}}.</ref> and Jack Indritz:<ref name="indritz">{{citation
 | last1 = Indritz | first1 = Jack
 | doi = 10.1090/S0002-9939-1961-0132852-2
 | issue = 6
 | journal = [[Proceedings of the American Mathematical Society]]
 | mr = 0132852
 | pages = 981–983
 | title = An inequality for Hermite polynomials
 | volume = 12
 | year = 1961| doi-access = free
 }}</ref>
<math display="block"> \bigl|\psi_n(x)\bigr| \le \pi^{-\frac14}.</math>