Clausius-Mossotti
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The Clausius-Mossotti equation is named after the Italian physicist Ottaviano-Fabrizio Mossotti, whose 1850 book analyzed the relationship between the dielectric constants of two different media, and the German physicist Rudolf Clausius, who gave the formula explicitly in his 1879 book in the context not of dielectric constants but of indices of refraction. The same formula also arises in the context of conductivity, in which it is known as Maxwell's formula. It arises yet again in the context of refractivity, in which it is known as the Lorentz-Lorenz formula.
Asteroid 4542 Mossotti was named for him after its discovery in 1989. (See the Wikipedeia list of asteroids for details).
References
Konstantin Z. Markov, Elementary Micromechanics of Heterogeneous Media, Chapter 1 in the collection: Heterogeneous Media: Modelling and Simulation, edited by Konstantin Z. Markov and Luigi Preziosi, Birkhauser Boston, 1999, pp. 1–-162. Available online at http://www.fmi.uni-sofia.bg/fmi/contmech/kmarkov/pub/survey.pdf.