docs: document set theory symbols

These symbols confused me so I wanted to gloss them to help future users. You can see the context here: https://discourse.nixos.org/t/flakes-what-does-mean-big-bundle-of-questions
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Eli Flanagan 2021-11-30 11:13:46 -05:00
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store. It can contain regular files, directories and symbolic
links. NARs are generated and unpacked using `nix-store --dump`
and `nix-store --restore`.
- `∅` \
The empty set symbol. In the context of package history, this denotes a package was not present prior to installation.
- `ε` \
The epsilon symbol. In the context of a package, this means the version is empty. More precisely, the derivation does not have a version attribute.