Talk:Natural deduction

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Philosophy: Logic Mid‑importance

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PBC?

In the section "Gentzen-style inference rules", rules are listed. The last one has a caption "PBC". It's the first time for me to find it for one of the basic inference rules.
Is this usage correct? It's the term "RAA" I expected.
I know "RBC" is abbrv. of "Rule by Cases", but it should be fit to ∨-elim, which appears to be unnatural for selection of only two propositions. Masuo64 (talk) 10:44, 10 October 2024 (UTC)[reply]