The zeroth theorem of the history of science (enunciated by E. P. Fischer) and widely known in the mathematics community as Arnol’d’s principle states that a discovery (rule, regularity, or insight) named after someone often did not originate with that person. I present five examples from physics: the Lorentz condition defining the Lorentz gauge of the electromagnetic potentials, the Dirac delta function , the Schumann resonances of the Earth-ionosphere cavity, the Weizsäcker–Williams method of virtual quanta, and the Bargmann, Michel, and Telegdi equation of spin dynamics. I give sketches of both the actual and reputed discoverers and quote from their “discovery” publications.
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In 1867, the partial derivative notation was not in use. Ordinary derivatives and partial derivatives were distinguished by context.
Use of the height of the ionosphere instead of leads to different modes of much higher frequencies.
Williams's first application is to the ionization of atoms, followed by electrodistintegration of nuclei, bremsstrahlung, pair production by photons on nuclei, , and “bremsstrahlung” by photons on electrons or nuclei.
I put FitzGerald’s name second because he treated only the lowest resonant mode.