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use PDG for derivation in paper appendix
The Physics Derivation Graph provides a very detailed explanation of how complicated derivations are carried out. It also explicitly enumerates the assumptions necessary to perform derivations. Imposing these requirements on researchers would require clear and significant benefit to both the individual researchers and the community.
Peer-reviewed journal articles are one of the current methods of demonstrating value in the scientific community. Conciseness is a feature of this writing style, and the mathematics presented is correspondingly sparse -- just sufficient to covey the author's intention. This results in a burden on the reader of the article, either to take the author's claims on faith, or to re-derive the mathematical expressions. A reader's derivation is complicated by implicit assumptions made by the author and unintentional mistakes in calculation.
With journals allowing supplemental materials for articles, calculations could be included. However, it is not clear what the appropriate level of detail is in supplied calculations. The intention is to be able to reproduce the work, but validation via computer.