Equivalence of Inertial and Gravitational mass

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Alan Grayson

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Jun 21, 2025, 12:24:39 AM6/21/25
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In what way, if any, did the equivalence of inertial and gravitational mass play in the development of GR? TY, AG

John Clark

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Jun 21, 2025, 3:37:37 PM6/21/25
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On Sat, Jun 21, 2025 at 12:24 AM Alan Grayson <agrays...@gmail.com> wrote:

> In what way, if any, did the equivalence of inertial and gravitational mass play in the development of GR? TY, AG

According to Einstein the Equivalence Principle was crucial in the evolution of his thoughts. Einstein said the idea occurred to him in 1908 and gave him the incentive to learn 4D non-Euclidean tensor calculus which at the time he didn't know very well; he said it was "the happiest thought of my life" although it took him another seven years, until 1915. before he found a way to use it to invent General Relativity. And the effort nearly killed him.   

 John K Clark    See what's on my new list at  Extropolis
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Alan Grayson

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Jun 21, 2025, 4:04:32 PM6/21/25
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You haven't addressed my question. AG 
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Alan Grayson

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Jun 21, 2025, 4:27:30 PM6/21/25
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Maybe you have! AG

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