Repository URL:
http://philsci-archive.pitt.edu/id/eprint/903
Author(s):
Elena Castellani
preprint description
This paper is devoted to examining the relevance of Dirac's view on the use of transformation theory and invariants in modern physics --- as it emerges from his 1930 book on quantum mechanics as well as from his later work on singular theories and constraints --- to current reflections on the meaning of physical symmetries, especially gauge symmetries.

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