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Theorem coeq12i 4880
 Description: Equality inference for composition of two classes. (Contributed by FL, 7-Jun-2012.)
Hypotheses
Ref Expression
coeq12i.1 A = B
coeq12i.2 C = D
Assertion
Ref Expression
coeq12i (A C) = (B D)

Proof of Theorem coeq12i
StepHypRef Expression
1 coeq12i.1 . . 3 A = B
21coeq1i 4876 . 2 (A C) = (B C)
3 coeq12i.2 . . 3 C = D
43coeq2i 4877 . 2 (B C) = (B D)
52, 4eqtri 2373 1 (A C) = (B D)
 Colors of variables: wff setvar class Syntax hints:   = wceq 1642   ∘ ccom 4721 This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1546  ax-5 1557  ax-17 1616  ax-9 1654  ax-8 1675  ax-6 1729  ax-7 1734  ax-11 1746  ax-12 1925  ax-ext 2334 This theorem depends on definitions:  df-bi 177  df-or 359  df-an 360  df-nan 1288  df-tru 1319  df-ex 1542  df-nf 1545  df-sb 1649  df-clab 2340  df-cleq 2346  df-clel 2349  df-nfc 2478  df-v 2861  df-nin 3211  df-compl 3212  df-in 3213  df-ss 3259  df-opab 4623  df-br 4640  df-co 4726 This theorem is referenced by:  cnvpprod  5841
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