After graduation, Rodrigues became a banker. A close associate of the Comte de Saint-Simon, Rodrigues continued, after Saint-Simon's death in 1825, to champion the older man's socialist ideals, a school of thought that came to be known as Saint-Simonianism. During this period, Rodrigues published writings on politics, social reform, and banking.
Rodrigues' 1840 paper developed new results on transformation groups.[9] It uses three numbers to parameterize the entries of a rotation matrix using only rational functions. When converted to four parameters, this representation is equivalent to a unit-norm quaternion, and describes the axis and angle of a rotation. In addition, he applied spherical trigonometry to relate changes in rotation axis and angle due to the combined effect of two rotations. This formula is a precursor to the quaternion product of William Rowan Hamilton.[10][11] In 1846, Arthur Cayley acknowledged[12] Euler's and Rodrigues' priority describing orthogonal transformations.
Rodrigues is credited as originating the idea of the artist as an avant-garde.[13]
^Simon Altmann, "Rotations, Quaternions and Double Groups"(Clarendon Press, Oxford, 1986, ISBN0-19-855372-2): "The family is often said to have been of Spanish origin, but the spelling of the family name rather suggests Portuguese descent (as indeed asserted by the 'Enciclopedia Universal Illustrada Espasa-Calpe')". For more information on the Rodrigues as Portuguese Jews in Bordeaux see also the Jewish Encyclopedia "?". Jewish Encyclopedia.
^Friedberg, Richard M. (2022). "Rodrigues, Olinde: "Des lois géométriques qui régissent les déplacements d'un système solide...", translation and commentary". arXiv:2211.07787.
^John H. Conway, Derek A. Smith, On Quaternions and Octonions: Their Geometry, Arithmetic, and Symmetry. AK Peters, 2003, ISBN1-56881-134-9, p. 9
^Arthur Cayley (1846) "Sur Quelques Proprietes des Determinants Gauches", Crelle's Journal 32: 119–23, and Collected Mathematical Papers of Arthur Cayley, volume 1, page 335
^Margolin, Victor (1997). The struggle for utopia: Rodchenko, Lissitzky, Moholy-Nagy, 1917-1946. Chicago: University of Chicago Press. ISBN978-0-226-50516-9.