On time-free functions

Schwarz, Gideon

doi:10.1090/S0002-9947-1972-0293025-8

On time-free functions
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Trans. Amer. Math. Soc. 167 (1972), 471-478 Request permission

Abstract:

By regarding as equivalent any two real-valued functions of a real variable that can be obtained from each other by a monotone continuous transformation of the independent variable, time-free functions are defined. A convenient maximal invariant is presented, and applied to some time-free functional equations.

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