Deriving the Equivalence Principle from Inertial Special Relativity

This work presents the<b> </b><b><i>first theoretical proof</i></b> that Newtonian gravity and the equality of inertial and gravitational mass <b><i>m</i></b>_{<i><strong>i</strong></i>}<b><i> = m</i></b>_{<i><strong>g</strong></i>}<b> </b>follow directly from an inertial extension of special relativity. The equivalence principle is no longer a postulate but a derived consequence of vacuum inertia. This marks a fundamental step in reframing the foundations of gravitation. I warmly welcome discussion and collaboration on these results at any time.