# Derivation

In science, derivation refers to sequence of statements or equations according to which one result, in a chain of proofs, is a necessary consequence or logical deduction of previously accepted statements or relations, based on sound verifiable evidence, established truth, and or measured observations of natural phenomena. [1]

Thermodynamics
In thermodynamics, the so-called Bridgman formulas, done by Percy Bridgman (1925), are the most replete, clean, and organized way of deriving thermodynamic expressions from the partial derivatives of the ten (or eight) main thermodynamic quantities (or variables), P, V, T, E, H, S, A, and F (see: symbols), of which there are 8 x 7 x 6 first (partial) derivatives; which in full amounts to the first derivatives of the 10 fundamental quantities, yeilding 720 equations, organized into 10 groups, based on which variable was held constant during the differentiation.

Quotes
The following are related quotes:

“Everyone knows that Shannon’s derivation is in error.”
Benoit Mandelbrot (1961), audience comment to Myron Tribus on Claude Shannon’s 1948 information entropy derivation [2]