Spell out some abbreviations.

metamath / set.mm

Metamath source file for logic and set theory

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Closed benjub closed 3 months ago

benjub commented 3 months ago

at the first occurrence of "first-order logic", I mention the common abbreviation "FOL"
in the comment of df-clab, I clarify "the LHS (definiendum)" to "the definiendum (the left-hand side of the biconditional), and I spell out the second occurrence of "LHS".
at the first comment having "LHS" and "RHS", I give their meanings.

benjub commented 3 months ago

Thanks Wolf for the approval, and sorry for the second commit. It's probably better to see them separately anyway.

(No other commits in this PR, unless requested by reviewers.)