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nix/doc/manual/source/store/math-notation.md
John Ericson 72d0f7b619 Document "hash derivation quotiented", resolution, and build trace 
Progress on #13405, which asks for an explicit characterisation of the
equivalence relation like the one given here.

Also progress on #11895, because we're using the term "build trace
entry" instead of "realisation".

Mention #9259, a future work item.

Co-authored-by: Robert Hensing <roberth@users.noreply.github.com>
2025-11-03 15:18:18 -05:00

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Appendix: Math notation

A few times in this manual, formal "proof trees" are used for natural deduction-style definition of various relations.

The following grammar and assignment of metavariables to syntactic categories is used in these sections.

\begin{align} s, t &\in \text{store-path} \\ o &\in \text{output-name} \\ i, p &\in \text{deriving-path} \\ d &\in \text{derivation} \end{align}

\begin{align} \text{deriving-path} \quad p &::= s \mid (p, o) \end{align}