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Theorem pm3.21 262
Description: Join antecedents with conjunction. Theorem *3.21 of [WhiteheadRussell] p. 111. (Contributed by NM, 5-Aug-1993.)
Assertion
Ref Expression
pm3.21 (𝜑 → (𝜓 → (𝜓𝜑)))

Proof of Theorem pm3.21
StepHypRef Expression
1 pm3.2 138 . 2 (𝜓 → (𝜑 → (𝜓𝜑)))
21com12 30 1 (𝜑 → (𝜓 → (𝜓𝜑)))
Colors of variables: wff set class
Syntax hints:  wi 4  wa 103
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia3 107
This theorem is referenced by:  pm3.22  263  iba  298  ancr  319  anc2r  326  pm5.31  345  xoranor  1355  19.41h  1663  19.41  1664  ltsopr  7416  bj-findis  13261
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