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Theorem nfso 5552
Description: Bound-variable hypothesis builder for total orders. (Contributed by Stefan O'Rear, 20-Jan-2015.)
Hypotheses
Ref Expression
nfpo.r 𝑥𝑅
nfpo.a 𝑥𝐴
Assertion
Ref Expression
nfso 𝑥 𝑅 Or 𝐴

Proof of Theorem nfso
Dummy variables 𝑎 𝑏 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 df-so 5547 . 2 (𝑅 Or 𝐴 ↔ (𝑅 Po 𝐴 ∧ ∀𝑎𝐴𝑏𝐴 (𝑎𝑅𝑏𝑎 = 𝑏𝑏𝑅𝑎)))
2 nfpo.r . . . 4 𝑥𝑅
3 nfpo.a . . . 4 𝑥𝐴
42, 3nfpo 5551 . . 3 𝑥 𝑅 Po 𝐴
5 nfcv 2908 . . . . . . 7 𝑥𝑎
6 nfcv 2908 . . . . . . 7 𝑥𝑏
75, 2, 6nfbr 5153 . . . . . 6 𝑥 𝑎𝑅𝑏
8 nfv 1918 . . . . . 6 𝑥 𝑎 = 𝑏
96, 2, 5nfbr 5153 . . . . . 6 𝑥 𝑏𝑅𝑎
107, 8, 9nf3or 1909 . . . . 5 𝑥(𝑎𝑅𝑏𝑎 = 𝑏𝑏𝑅𝑎)
113, 10nfralw 3295 . . . 4 𝑥𝑏𝐴 (𝑎𝑅𝑏𝑎 = 𝑏𝑏𝑅𝑎)
123, 11nfralw 3295 . . 3 𝑥𝑎𝐴𝑏𝐴 (𝑎𝑅𝑏𝑎 = 𝑏𝑏𝑅𝑎)
134, 12nfan 1903 . 2 𝑥(𝑅 Po 𝐴 ∧ ∀𝑎𝐴𝑏𝐴 (𝑎𝑅𝑏𝑎 = 𝑏𝑏𝑅𝑎))
141, 13nfxfr 1856 1 𝑥 𝑅 Or 𝐴
Colors of variables: wff setvar class
Syntax hints:  wa 397  w3o 1087  wnf 1786  wnfc 2888  wral 3065   class class class wbr 5106   Po wpo 5544   Or wor 5545
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1798  ax-4 1812  ax-5 1914  ax-6 1972  ax-7 2012  ax-8 2109  ax-9 2117  ax-10 2138  ax-11 2155  ax-12 2172  ax-ext 2708
This theorem depends on definitions:  df-bi 206  df-an 398  df-or 847  df-3or 1089  df-3an 1090  df-tru 1545  df-fal 1555  df-ex 1783  df-nf 1787  df-sb 2069  df-clab 2715  df-cleq 2729  df-clel 2815  df-nfc 2890  df-ral 3066  df-rab 3409  df-v 3448  df-dif 3914  df-un 3916  df-in 3918  df-ss 3928  df-nul 4284  df-if 4488  df-sn 4588  df-pr 4590  df-op 4594  df-br 5107  df-po 5546  df-so 5547
This theorem is referenced by:  nfwe  5610
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