1879 - Jožef Stefan observes that the total radiant flux from a blackbody is proportional to the fourth power of its temperature and states the Stefan-Boltzmann law
1884 - Ludwig Boltzmann derives the Stefan-Boltzmann blackbody radiant flux law from thermodynamic considerations
1888 - Henri-Louis Le Chatelier[?] states that the response of a chemical system perturbed from equilbrium will be to counteract the perturbation
1893 - Wilhelm Wien discovers the displacement law for a blackbody's maximum specific intensity
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The symbol
<math>\pm \sqrt {b^2-4ac}</math>
in the formula should be understood as "either of those element(s) of the field whose square equals b2 - ...