Einstein energy equation E = mc2 is used to structurally unify Maxwell's electromagnetic field with real matter that has a mass, such a subatomic particles, but the energy E of Einstein's energy equation represents the energy of a massless EM photon; consequently, the inertia (m) of Einstein's energy equation is massless; therefore, Einstein energy equation cannot be used to justify the electromagnetic theory of matter.
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"The acceptance of the "electromagnetic theory of matter" has been a very important factor in the evolution of scientific and philosophical thought. Since the rise of modern science (around 1600) the prevailing opinion among scientists was the belief in a "mechanistic science," which means the belief that physical phenomena are "understood" or "explained" only if these phenomena can be reduced to Newton's laws of motion. Obviously, the "electromagnetic theory of matter" has dropped this requirement. It was stated, starting with Heinrich Hertz, that man must cease trying to reduced all physical phenomena to the laws of mechanics. It was required, instead, that all physical facts must be derived from Maxwell's laws of the electromagnetic field. This meant a radical change in the meaning of the conception of "understanding" or "explaining." The requirement of a reduction to Newton's laws was raised because it was believed that these laws were "self-evident"; the reduction to Newton's mechanics proved a reduction to "intelligible" principles in the sense of Aristotle's, hardly anybody, however, would think that Maxwell's equations of the electromagnetic field were self-evident or intelligible. Therefore, the abandonment of a mechanistic explanation meant also dropping the request for a deduction from intelligible principles. Maxwell's equations of the electromagnetic field and Lorentz's hypothesis about the distribution of electric charges in "material" particles were accepted only because the observed facts about the motions of bodies and propagation of light could be derived. Thomas Aquinas' criterion for the "inferior" type of truth, the "scientific," not the "philosophical" truth, became the decisive criterion. Principle of physics were accepted if they could stand the test of logical consistency and empirical confirmation. The era of mechanistic physics was reaching its end, and the era of logico-empirical physics was beginning. Roughly speaking, we may say that the mechanistic era had extended from 1600 to 1900, and that the twentieth century opened with the logico-empirical conception of science in the making." (Frank, p. 132-133).
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"The acceptance of the "electromagnetic theory of matter" has been a very important factor in the evolution of scientific and philosophical thought. Since the rise of modern science (around 1600) the prevailing opinion among scientists was the belief in a "mechanistic science," which means the belief that physical phenomena are "understood" or "explained" only if these phenomena can be reduced to Newton's laws of motion. Obviously, the "electromagnetic theory of matter" has dropped this requirement. It was stated, starting with Heinrich Hertz, that man must cease trying to reduced all physical phenomena to the laws of mechanics. It was required, instead, that all physical facts must be derived from Maxwell's laws of the electromagnetic field. This meant a radical change in the meaning of the conception of "understanding" or "explaining." The requirement of a reduction to Newton's laws was raised because it was believed that these laws were "self-evident"; the reduction to Newton's mechanics proved a reduction to "intelligible" principles in the sense of Aristotle's, hardly anybody, however, would think that Maxwell's equations of the electromagnetic field were self-evident or intelligible. Therefore, the abandonment of a mechanistic explanation meant also dropping the request for a deduction from intelligible principles. Maxwell's equations of the electromagnetic field and Lorentz's hypothesis about the distribution of electric charges in "material" particles were accepted only because the observed facts about the motions of bodies and propagation of light could be derived. Thomas Aquinas' criterion for the "inferior" type of truth, the "scientific," not the "philosophical" truth, became the decisive criterion. Principle of physics were accepted if they could stand the test of logical consistency and empirical confirmation. The era of mechanistic physics was reaching its end, and the era of logico-empirical physics was beginning. Roughly speaking, we may say that the mechanistic era had extended from 1600 to 1900, and that the twentieth century opened with the logico-empirical conception of science in the making." (Frank, p. 132-133).