Einstein’s E=√((mc²)²+(cp)²) generates the wave equations of electrons and light.
Apply Planck and de Broglie operators.
For m≠0,
s=1/2 it produces the Dirac equation (reducing to Schrödinger when v≪c); for m=0,
s=1 it becomes Maxwell’s equations written as (i/c)∂Ψ/∂t = ∇×Ψ with Ψ=E+iB.
These govern modern electronics and photonics. The same square-root energy unites particle and field.
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