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The [[Theory of Relativity]] has never been able to mathematically derive '''E=mc²''' from first principles (see the [http://www.conservapedia.com/E%3Dmc%C2%B2#See_also See also] section for a derivation), and a physicist observed in a peer-reviewed paper published in 2011 that "Leaving aside that it continues to be affirmed experimentally, a rigorous proof of the mass-energy equivalence is probably beyond the purview of the special theory."<ref>[http://adsabs.harvard.edu/abs/2011AmJPh..79..591H Eugene Hecht: ''How Einstein confirmed E<sub>0</sub>=mc²'', American Journal of Physics, Volume 79, Issue 6, pp. 591-600 (2011)]</ref> Nevertheless, Robert Dicke - one of the most accomplished American-born physicists and experimental physicists in history - found it unlikely that the equivalence was wrong.<ref>R. H. Dicke "The Theoretical Significance of Experimental Relativity", Gordon and Breach, 1964</ref>
The [[Theory of Relativity]] has never been able to mathematically derive '''E=mc²''' from first principles (see the [http://www.conservapedia.com/E%3Dmc%C2%B2#See_also See also] section for a derivation), and a physicist observed in a peer-reviewed paper published in 2011 that "Leaving aside that it continues to be affirmed experimentally, a rigorous proof of the mass-energy equivalence is probably beyond the purview of the special theory."<ref>[http://adsabs.harvard.edu/abs/2011AmJPh..79..591H Eugene Hecht: ''How Einstein confirmed E<sub>0</sub>=mc²'', American Journal of Physics, Volume 79, Issue 6, pp. 591-600 (2011)]</ref> Nevertheless, Robert Dicke - one of the most accomplished American-born physicists and experimental physicists in history - found it unlikely that the equivalence was wrong.<ref>R. H. Dicke "The Theoretical Significance of Experimental Relativity", Gordon and Breach, 1964</ref>
It has been known for a long time that radiation has a mass equivalence, which was correctly derived by [[Henri Poincare]] in 1904,<ref>[http://www.opticsinfobase.org/josa/abstract.cfm?uri=josa-42-8-540 Herbert E. Ives ''Derivation of the Mass-Energy Relation'', JOSA, Vol. 42, Issue 8, pp. 540-543 (1952)]</ref> but the equation '''E=mc²''' makes a claim far beyond that limited circumstance:
It has been known for a long time that radiation has a mass equivalence, which was correctly derived by [[Henri Poincaré]] in 1904,<ref>[http://www.opticsinfobase.org/josa/abstract.cfm?uri=josa-42-8-540 Herbert E. Ives ''Derivation of the Mass-Energy Relation'', JOSA, Vol. 42, Issue 8, pp. 540-543 (1952)]</ref> but the equation '''E=mc²''' makes a claim far beyond that limited circumstance:
{{cquote|The equality of the mass equivalent of radiation to the mass lost by a radiating body is derivable from Poincaré’s momentum of radiation (1900) and his principle of relativity (1904).|||[[Herbert Ives]], 1952}}
{{cquote|The equality of the mass equivalent of radiation to the mass lost by a radiating body is derivable from Poincaré’s momentum of radiation (1900) and his principle of relativity (1904).|||[[Herbert Ives]], 1952}}