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Theorem limeq 5773
Description: Equality theorem for the limit predicate. (Contributed by NM, 22-Apr-1994.) (Proof shortened by Andrew Salmon, 25-Jul-2011.)
Assertion
Ref Expression
limeq (𝐴 = 𝐵 → (Lim 𝐴 ↔ Lim 𝐵))

Proof of Theorem limeq
StepHypRef Expression
1 ordeq 5768 . . 3 (𝐴 = 𝐵 → (Ord 𝐴 ↔ Ord 𝐵))
2 neeq1 2885 . . 3 (𝐴 = 𝐵 → (𝐴 ≠ ∅ ↔ 𝐵 ≠ ∅))
3 id 22 . . . 4 (𝐴 = 𝐵𝐴 = 𝐵)
4 unieq 4476 . . . 4 (𝐴 = 𝐵 𝐴 = 𝐵)
53, 4eqeq12d 2666 . . 3 (𝐴 = 𝐵 → (𝐴 = 𝐴𝐵 = 𝐵))
61, 2, 53anbi123d 1439 . 2 (𝐴 = 𝐵 → ((Ord 𝐴𝐴 ≠ ∅ ∧ 𝐴 = 𝐴) ↔ (Ord 𝐵𝐵 ≠ ∅ ∧ 𝐵 = 𝐵)))
7 df-lim 5766 . 2 (Lim 𝐴 ↔ (Ord 𝐴𝐴 ≠ ∅ ∧ 𝐴 = 𝐴))
8 df-lim 5766 . 2 (Lim 𝐵 ↔ (Ord 𝐵𝐵 ≠ ∅ ∧ 𝐵 = 𝐵))
96, 7, 83bitr4g 303 1 (𝐴 = 𝐵 → (Lim 𝐴 ↔ Lim 𝐵))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 196  w3a 1054   = wceq 1523  wne 2823  c0 3948   cuni 4468  Ord word 5760  Lim wlim 5762
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1762  ax-4 1777  ax-5 1879  ax-6 1945  ax-7 1981  ax-9 2039  ax-10 2059  ax-11 2074  ax-12 2087  ax-13 2282  ax-ext 2631
This theorem depends on definitions:  df-bi 197  df-or 384  df-an 385  df-3an 1056  df-tru 1526  df-ex 1745  df-nf 1750  df-sb 1938  df-clab 2638  df-cleq 2644  df-clel 2647  df-nfc 2782  df-ne 2824  df-ral 2946  df-rex 2947  df-in 3614  df-ss 3621  df-uni 4469  df-tr 4786  df-po 5064  df-so 5065  df-fr 5102  df-we 5104  df-ord 5764  df-lim 5766
This theorem is referenced by:  limuni2  5824  0ellim  5825  limuni3  7094  tfinds2  7105  dfom2  7109  limomss  7112  nnlim  7120  limom  7122  ssnlim  7125  onfununi  7483  tfr1a  7535  tz7.44lem1  7546  tz7.44-2  7548  tz7.44-3  7549  oeeulem  7726  limensuc  8178  elom3  8583  r1funlim  8667  rankxplim2  8781  rankxplim3  8782  rankxpsuc  8783  infxpenlem  8874  alephislim  8944  cflim2  9123  winalim  9555  rankcf  9637  gruina  9678  rdgprc0  31823  dfrdg2  31825  dfrdg4  32183  limsucncmpi  32569  limsucncmp  32570
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