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Theorem exmidsbthr 17239
Description: The Schroeder-Bernstein Theorem implies excluded middle. Theorem 1 of [PradicBrown2022], p. 1. (Contributed by Jim Kingdon, 11-Aug-2022.)
Assertion
Ref Expression
exmidsbthr (∀𝑥∀𝑦((𝑥 ≼ 𝑦 ∧ 𝑦 ≼ 𝑥) → 𝑥 ≈ 𝑦) → EXMID)
Distinct variable group:   𝑥,𝑦

Proof of Theorem exmidsbthr
Dummy variables 𝑖 𝑗 𝑝 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 eqeq1 2245 . . . . 5 (𝑗 = 𝑖 → (𝑗 = ∅ ↔ 𝑖 = ∅))
2 unieq 3944 . . . . . 6 (𝑗 = 𝑖 → ∪ 𝑗 = ∪ 𝑖)
32fveq2d 5699 . . . . 5 (𝑗 = 𝑖 → (𝑝‘∪ 𝑗) = (𝑝‘∪ 𝑖))
41, 3ifbieq2d 3665 . . . 4 (𝑗 = 𝑖 → if(𝑗 = ∅, 1o, (𝑝‘∪ 𝑗)) = if(𝑖 = ∅, 1o, (𝑝‘∪ 𝑖)))
54cbvmptv 4227 . . 3 (𝑗 ∈ ω ↦ if(𝑗 = ∅, 1o, (𝑝‘∪ 𝑗))) = (𝑖 ∈ ω ↦ if(𝑖 = ∅, 1o, (𝑝‘∪ 𝑖)))
65mpteq2i 4218 . 2 (𝑝 ∈ ℕ∞ ↦ (𝑗 ∈ ω ↦ if(𝑗 = ∅, 1o, (𝑝‘∪ 𝑗)))) = (𝑝 ∈ ℕ∞ ↦ (𝑖 ∈ ω ↦ if(𝑖 = ∅, 1o, (𝑝‘∪ 𝑖))))
76exmidsbthrlem 17238 1 (∀𝑥∀𝑦((𝑥 ≼ 𝑦 ∧ 𝑦 ≼ 𝑥) → 𝑥 ≈ 𝑦) → EXMID)
Colors of variables:    wff set class
This proof depends on syntax axioms:   → wi 4   ∧ wa 104  ∀wal 1400   = wceq 1402  ∅c0 3520  ifcif 3638  ∪ cuni 3935   class class class wbr 4130   ↦ cmpt 4192  EXMIDwem 4331  ωcom 4737  ‘cfv 5377  1oc1o 6680   ≈ cen 7020   ≼ cdom 7021  ℕ∞xnninf 7460
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-in1 623  ax-in2 624  ax-io 721  ax-5 1500  ax-7 1501  ax-gen 1502  ax-ie1 1546  ax-ie2 1547  ax-8 1557  ax-10 1558  ax-11 1559  ax-i12 1560  ax-bndl 1562  ax-4 1563  ax-17 1579  ax-i9 1583  ax-ial 1587  ax-i5r 1588  ax-13 2211  ax-14 2212  ax-ext 2220  ax-coll 4246  ax-sep 4249  ax-nul 4259  ax-pow 4311  ax-pr 4346  ax-un 4578  ax-setind 4684  ax-iinf 4735
This proof depends on definitions:  df-bi 117  df-dc 847  df-3or 1010  df-3an 1011  df-tru 1405  df-fal 1408  df-nf 1514  df-sb 1816  df-eu 2089  df-mo 2090  df-clab 2225  df-cleq 2231  df-clel 2234  df-nfc 2381  df-ne 2421  df-ral 2533  df-rex 2534  df-reu 2535  df-rab 2537  df-v 2823  df-sbc 3052  df-csb 3148  df-dif 3222  df-un 3224  df-in 3226  df-ss 3233  df-nul 3521  df-if 3639  df-pw 3690  df-sn 3715  df-pr 3716  df-op 3718  df-uni 3936  df-int 3971  df-iun 4014  df-br 4131  df-opab 4193  df-mpt 4194  df-tr 4230  df-exmid 4332  df-id 4438  df-iord 4511  df-on 4513  df-suc 4516  df-iom 4738  df-xp 4780  df-rel 4781  df-cnv 4782  df-co 4783  df-dm 4784  df-rn 4785  df-res 4786  df-ima 4787  df-iota 5337  df-fun 5379  df-fn 5380  df-f 5381  df-f1 5382  df-fo 5383  df-f1o 5384  df-fv 5385  df-ov 6088  df-oprab 6089  df-mpo 6090  df-1st 6374  df-2nd 6375  df-1o 6687  df-2o 6688  df-map 6924  df-en 7023  df-dom 7024  df-dju 7379  df-inl 7388  df-inr 7389  df-case 7425  df-nninf 7461  df-omni 7476
This theorem is used by:  exmidsbth  17240
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