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Theorem disjeq12d 4431
 Description: Equality theorem for disjoint collection. (Contributed by Mario Carneiro, 14-Nov-2016.)
Hypotheses
Ref Expression
disjeq1d.1
disjeq12d.1
Assertion
Ref Expression
disjeq12d
Distinct variable groups:   ,   ,   ,

Proof of Theorem disjeq12d
StepHypRef Expression
1 disjeq1d.1 . . 3
21disjeq1d 4430 . 2
3 disjeq12d.1 . . . 4
 Colors of variables: wff setvar class Syntax hints:  ->wi 4  <->wb 184  =wceq 1395  e.wcel 1818  Disj_wdisj 4422 This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1618  ax-4 1631  ax-5 1704  ax-6 1747  ax-7 1790  ax-10 1837  ax-11 1842  ax-12 1854  ax-13 1999  ax-ext 2435 This theorem depends on definitions:  df-bi 185  df-an 371  df-tru 1398  df-ex 1613  df-nf 1617  df-sb 1740  df-eu 2286  df-mo 2287  df-clab 2443  df-cleq 2449  df-clel 2452  df-ral 2812  df-rmo 2815  df-in 3482  df-ss 3489  df-disj 4423