Theorem exmidsbthr 17042

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.

Step	Hyp	Ref	Expression
1		eqeq1 2245	. . . . 5 ⊢ (𝑗 = 𝑖 → (𝑗 = ∅ ↔ 𝑖 = ∅))
2		unieq 3942	. . . . . 6 ⊢ (𝑗 = 𝑖 → ∪ 𝑗 = ∪ 𝑖)
3	2	fveq2d 5697	. . . . 5 ⊢ (𝑗 = 𝑖 → (𝑝‘∪ 𝑗) = (𝑝‘∪ 𝑖))
4	1, 3	ifbieq2d 3665	. . . 4 ⊢ (𝑗 = 𝑖 → if(𝑗 = ∅, 1o, (𝑝‘∪ 𝑗)) = if(𝑖 = ∅, 1o, (𝑝‘∪ 𝑖)))
5	4	cbvmptv 4225	. . 3 ⊢ (𝑗 ∈ ω ↦ if(𝑗 = ∅, 1o, (𝑝‘∪ 𝑗))) = (𝑖 ∈ ω ↦ if(𝑖 = ∅, 1o, (𝑝‘∪ 𝑖)))
6	5	mpteq2i 4216	. 2 ⊢ (𝑝 ∈ ℕ∞ ↦ (𝑗 ∈ ω ↦ if(𝑗 = ∅, 1o, (𝑝‘∪ 𝑗)))) = (𝑝 ∈ ℕ∞ ↦ (𝑖 ∈ ω ↦ if(𝑖 = ∅, 1o, (𝑝‘∪ 𝑖))))
7	6	exmidsbthrlem 17041	1 ⊢ (∀𝑥∀𝑦((𝑥 ≼ 𝑦 ∧ 𝑦 ≼ 𝑥) → 𝑥 ≈ 𝑦) → EXMID)

Syntax hints:   → wi 4   ∧ wa 104  ∀wal 1400   = wceq 1402  ∅c0 3520  ifcif 3638  ∪ cuni 3933   class class class wbr 4128   ↦ cmpt 4190  EXMIDwem 4329  ωcom 4735  ‘cfv 5375  1_oc1o 6674   ≈ cen 7014   ≼ cdom 7015  ℕ_∞xnninf 7453

This theorem was proved from 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 4244  ax-sep 4247  ax-nul 4257  ax-pow 4309  ax-pr 4344  ax-un 4576  ax-setind 4682  ax-iinf 4733

This theorem 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 3714  df-pr 3715  df-op 3717  df-uni 3934  df-int 3969  df-iun 4012  df-br 4129  df-opab 4191  df-mpt 4192  df-tr 4228  df-exmid 4330  df-id 4436  df-iord 4509  df-on 4511  df-suc 4514  df-iom 4736  df-xp 4778  df-rel 4779  df-cnv 4780  df-co 4781  df-dm 4782  df-rn 4783  df-res 4784  df-ima 4785  df-iota 5335  df-fun 5377  df-fn 5378  df-f 5379  df-f1 5380  df-fo 5381  df-f1o 5382  df-fv 5383  df-ov 6082  df-oprab 6083  df-mpo 6084  df-1st 6368  df-2nd 6369  df-1o 6681  df-2o 6682  df-map 6918  df-en 7017  df-dom 7018  df-dju 7372  df-inl 7381  df-inr 7382  df-case 7418  df-nninf 7454  df-omni 7469

This theorem is referenced by:  exmidsbth  17043