failed to convince the physics community that quantum physics is entirely about fields. After all, Dirac’s equation, especially its quantized version, obviously described an extended matter field Ψ that was analogous to the EM field of Maxwell’s equations. Yet, most physicists continued to insist that this same entity Ψ, when it appeared in Schrödinger’s equation, described low-energy material particles. So the same physical concept, Ψ, somehow represented particles in Schrödinger’s equation but a field in Dirac’s equation, even though Schrödinger’s equation was simply Dirac’s equation
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