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Theorem freq2 4855
 Description: Equality theorem for the well-founded predicate. (Contributed by NM, 3-Apr-1994.)
Assertion
Ref Expression
freq2

Proof of Theorem freq2
StepHypRef Expression
1 eqimss2 3556 . . 3
2 frss 4851 . . 3
31, 2syl 16 . 2
4 eqimss 3555 . . 3
5 frss 4851 . . 3
64, 5syl 16 . 2
73, 6impbid 191 1
 Colors of variables: wff setvar class Syntax hints:  ->wi 4  <->wb 184  =wceq 1395  C_wss 3475  Frwfr 4840 This theorem is referenced by:  weeq2  4873  frsn  5075  f1oweALT  6784  frfi  7785  freq12d  30984  ifr0  31359 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-clab 2443  df-cleq 2449  df-clel 2452  df-in 3482  df-ss 3489  df-fr 4843
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