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Theorem noseponlem 33245
Description: Lemma for nosepon 33246. Consider a case of proper subset domain. (Contributed by Scott Fenton, 21-Sep-2020.)
Assertion
Ref Expression
noseponlem ((𝐴 No 𝐵 No ∧ dom 𝐴 ∈ dom 𝐵) → ¬ ∀𝑥 ∈ On (𝐴𝑥) = (𝐵𝑥))
Distinct variable groups:   𝑥,𝐴   𝑥,𝐵

Proof of Theorem noseponlem
StepHypRef Expression
1 nodmon 33231 . . . 4 (𝐴 No → dom 𝐴 ∈ On)
213ad2ant1 1130 . . 3 ((𝐴 No 𝐵 No ∧ dom 𝐴 ∈ dom 𝐵) → dom 𝐴 ∈ On)
3 nodmord 33234 . . . . . . 7 (𝐴 No → Ord dom 𝐴)
4 ordirr 6187 . . . . . . 7 (Ord dom 𝐴 → ¬ dom 𝐴 ∈ dom 𝐴)
53, 4syl 17 . . . . . 6 (𝐴 No → ¬ dom 𝐴 ∈ dom 𝐴)
653ad2ant1 1130 . . . . 5 ((𝐴 No 𝐵 No ∧ dom 𝐴 ∈ dom 𝐵) → ¬ dom 𝐴 ∈ dom 𝐴)
7 ndmfv 6682 . . . . 5 (¬ dom 𝐴 ∈ dom 𝐴 → (𝐴‘dom 𝐴) = ∅)
86, 7syl 17 . . . 4 ((𝐴 No 𝐵 No ∧ dom 𝐴 ∈ dom 𝐵) → (𝐴‘dom 𝐴) = ∅)
9 nosgnn0 33239 . . . . . . 7 ¬ ∅ ∈ {1o, 2o}
10 elno3 33236 . . . . . . . . . . 11 (𝐵 No ↔ (𝐵:dom 𝐵⟶{1o, 2o} ∧ dom 𝐵 ∈ On))
1110simplbi 501 . . . . . . . . . 10 (𝐵 No 𝐵:dom 𝐵⟶{1o, 2o})
12113ad2ant2 1131 . . . . . . . . 9 ((𝐴 No 𝐵 No ∧ dom 𝐴 ∈ dom 𝐵) → 𝐵:dom 𝐵⟶{1o, 2o})
13 simp3 1135 . . . . . . . . 9 ((𝐴 No 𝐵 No ∧ dom 𝐴 ∈ dom 𝐵) → dom 𝐴 ∈ dom 𝐵)
1412, 13ffvelrnd 6834 . . . . . . . 8 ((𝐴 No 𝐵 No ∧ dom 𝐴 ∈ dom 𝐵) → (𝐵‘dom 𝐴) ∈ {1o, 2o})
15 eleq1 2901 . . . . . . . 8 ((𝐵‘dom 𝐴) = ∅ → ((𝐵‘dom 𝐴) ∈ {1o, 2o} ↔ ∅ ∈ {1o, 2o}))
1614, 15syl5ibcom 248 . . . . . . 7 ((𝐴 No 𝐵 No ∧ dom 𝐴 ∈ dom 𝐵) → ((𝐵‘dom 𝐴) = ∅ → ∅ ∈ {1o, 2o}))
179, 16mtoi 202 . . . . . 6 ((𝐴 No 𝐵 No ∧ dom 𝐴 ∈ dom 𝐵) → ¬ (𝐵‘dom 𝐴) = ∅)
1817neqned 3018 . . . . 5 ((𝐴 No 𝐵 No ∧ dom 𝐴 ∈ dom 𝐵) → (𝐵‘dom 𝐴) ≠ ∅)
1918necomd 3066 . . . 4 ((𝐴 No 𝐵 No ∧ dom 𝐴 ∈ dom 𝐵) → ∅ ≠ (𝐵‘dom 𝐴))
208, 19eqnetrd 3078 . . 3 ((𝐴 No 𝐵 No ∧ dom 𝐴 ∈ dom 𝐵) → (𝐴‘dom 𝐴) ≠ (𝐵‘dom 𝐴))
21 fveq2 6652 . . . . 5 (𝑥 = dom 𝐴 → (𝐴𝑥) = (𝐴‘dom 𝐴))
22 fveq2 6652 . . . . 5 (𝑥 = dom 𝐴 → (𝐵𝑥) = (𝐵‘dom 𝐴))
2321, 22neeq12d 3072 . . . 4 (𝑥 = dom 𝐴 → ((𝐴𝑥) ≠ (𝐵𝑥) ↔ (𝐴‘dom 𝐴) ≠ (𝐵‘dom 𝐴)))
2423rspcev 3598 . . 3 ((dom 𝐴 ∈ On ∧ (𝐴‘dom 𝐴) ≠ (𝐵‘dom 𝐴)) → ∃𝑥 ∈ On (𝐴𝑥) ≠ (𝐵𝑥))
252, 20, 24syl2anc 587 . 2 ((𝐴 No 𝐵 No ∧ dom 𝐴 ∈ dom 𝐵) → ∃𝑥 ∈ On (𝐴𝑥) ≠ (𝐵𝑥))
26 df-ne 3012 . . . 4 ((𝐴𝑥) ≠ (𝐵𝑥) ↔ ¬ (𝐴𝑥) = (𝐵𝑥))
2726rexbii 3235 . . 3 (∃𝑥 ∈ On (𝐴𝑥) ≠ (𝐵𝑥) ↔ ∃𝑥 ∈ On ¬ (𝐴𝑥) = (𝐵𝑥))
28 rexnal 3226 . . 3 (∃𝑥 ∈ On ¬ (𝐴𝑥) = (𝐵𝑥) ↔ ¬ ∀𝑥 ∈ On (𝐴𝑥) = (𝐵𝑥))
2927, 28bitri 278 . 2 (∃𝑥 ∈ On (𝐴𝑥) ≠ (𝐵𝑥) ↔ ¬ ∀𝑥 ∈ On (𝐴𝑥) = (𝐵𝑥))
3025, 29sylib 221 1 ((𝐴 No 𝐵 No ∧ dom 𝐴 ∈ dom 𝐵) → ¬ ∀𝑥 ∈ On (𝐴𝑥) = (𝐵𝑥))
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wi 4  w3a 1084   = wceq 1538  wcel 2114  wne 3011  wral 3130  wrex 3131  c0 4265  {cpr 4541  dom cdm 5532  Ord word 6168  Oncon0 6169  wf 6330  cfv 6334  1oc1o 8082  2oc2o 8083   No csur 33221
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1797  ax-4 1811  ax-5 1911  ax-6 1970  ax-7 2015  ax-8 2116  ax-9 2124  ax-10 2145  ax-11 2161  ax-12 2178  ax-ext 2794  ax-rep 5166  ax-sep 5179  ax-nul 5186  ax-pow 5243  ax-pr 5307
This theorem depends on definitions:  df-bi 210  df-an 400  df-or 845  df-3an 1086  df-tru 1541  df-ex 1782  df-nf 1786  df-sb 2070  df-mo 2622  df-eu 2653  df-clab 2801  df-cleq 2815  df-clel 2894  df-nfc 2962  df-ne 3012  df-ral 3135  df-rex 3136  df-reu 3137  df-rab 3139  df-v 3471  df-sbc 3748  df-csb 3856  df-dif 3911  df-un 3913  df-in 3915  df-ss 3925  df-nul 4266  df-if 4440  df-sn 4540  df-pr 4542  df-op 4546  df-uni 4814  df-iun 4896  df-br 5043  df-opab 5105  df-mpt 5123  df-tr 5149  df-id 5437  df-eprel 5442  df-po 5451  df-so 5452  df-fr 5491  df-we 5493  df-xp 5538  df-rel 5539  df-cnv 5540  df-co 5541  df-dm 5542  df-rn 5543  df-res 5544  df-ima 5545  df-ord 6172  df-on 6173  df-suc 6175  df-iota 6293  df-fun 6336  df-fn 6337  df-f 6338  df-f1 6339  df-fo 6340  df-f1o 6341  df-fv 6342  df-1o 8089  df-2o 8090  df-no 33224
This theorem is referenced by:  nosepon  33246
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