Apparently, Einstein himself, credited Poincaré with the discovery of E = mc2 (for electromagnetic radiation).

Einstein applied his assumed correct radiation approximation that E = mc2 in 1906 (Ann. Physik 20 (1906):627) and did reference Poincaré's paper of 1900 ("La Théorie de Lorentz et le principe dela reaction," In Boscha (1900):252) and, at that time, did give Poincaré credit for the mass-energy equivalence (i.e., E = mc2) at the least, for electromagnetic radiation.

http://www.raherrmann.com/einpdf.pdf


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