Weinstein, Galina (2025) Einstein’s Hidden Scaffolding, with a Glance at Poincaré. [Preprint]
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Abstract
This paper reconstructs the derivations underlying the kinematical part of Einstein's 1905 special relativity paper, emphasizing their operational clarity and minimalist use of mathematics. Einstein employed modest tools—algebraic manipulations, Taylor expansions, partial differentials, and functional arguments—yet his method was guided by principles of linearity, symmetry, and invariance rather than the elaborate frameworks of electron theory. The published text in \emph{Annalen der Physik} concealed much of the algebraic scaffolding, presenting instead a streamlined sequence of essential equations. Far from reflecting a lack of sophistication, this economy of means was a deliberate rhetorical and philosophical choice: to demonstrate that relativity arises from two simple postulates and basic operational definitions, not from the complexities of electron theory. The reconstruction highlights how Einstein’s strategy subordinated mathematics to principle, advancing a new mode of reasoning in which physical insight, rather than computational elaboration, held decisive authority. In this respect, I show that Einstein’s presentation diverges sharply from Poincaré’s.
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