= Pascual Jordan
{c}
{tag=Physicist}
{title2=1902–1980}
{wiki}
= Pascual Ernst Jordan
{c}
{synonym}
= P. Jordan
{c}
{synonym}
<Pascual Jordan> and <Max Born> helped turn the new <quantum mechanics> into a systematic <matrix> calculus. In this description, a <position operator> and a <momentum operator> generally do not commute; the canonical rule is $[q,p]=i\hbar I$. The order of multiplication therefore carries physical information, rather than being a notational detail. Their 1925 paper developed the mathematical rules connecting these noncommuting quantities with the dynamics and transition frequencies of <quantum systems>.<Zur Quantenmechanik by Max Born and Pascual Jordan>[1925 paper, matrix multiplication and canonical quantum condition]{ref}
A <physicist> who developed <matrix mechanics> and held a professorship in <theoretical physics> at Hamburg.<Jordan, Pascual (1902–1980)>[Bezug zu Hamburg: theoretical physics professor; Lebenslauf: full name and 1902–1980 dates]{ref}
\Image[https://commons.wikimedia.org/wiki/Special:Redirect/file/Pascual%20Jordan%201920s.jpg?width=250]
{title=Portrait of <Pascual Jordan>}
{description=Unknown photographer; Mondadori Publishers. Public domain (anonymous historical photograph, as declared on Commons). Source and usage information on the linked Wikimedia file page.}
{source=https://commons.wikimedia.org/wiki/File:Pascual_Jordan_1920s.jpg}
{width=250}
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