Theorem enpr2dOLD 9118

Description: Obsolete version of enpr2d 9117 as of 23-Dec-2024. (Contributed by Rohan Ridenour, 3-Aug-2023.) (Proof modification is discouraged.) (New usage is discouraged.)

Hypotheses

Ref	Expression
enpr2dOLD.1	⊢ (𝜑 → 𝐴 ∈ 𝐶)
enpr2dOLD.2	⊢ (𝜑 → 𝐵 ∈ 𝐷)
enpr2dOLD.3	⊢ (𝜑 → ¬ 𝐴 = 𝐵)

Assertion

Ref	Expression
enpr2dOLD	⊢ (𝜑 → {𝐴, 𝐵} ≈ 2o)

Proof of Theorem enpr2dOLD

Step	Hyp	Ref	Expression
1		enpr2dOLD.1	. . . . 5 ⊢ (𝜑 → 𝐴 ∈ 𝐶)
2		ensn1g 9086	. . . . 5 ⊢ (𝐴 ∈ 𝐶 → {𝐴} ≈ 1o)
3	1, 2	syl 17	. . . 4 ⊢ (𝜑 → {𝐴} ≈ 1o)
4		enpr2dOLD.2	. . . . 5 ⊢ (𝜑 → 𝐵 ∈ 𝐷)
5		1on 8536	. . . . 5 ⊢ 1o ∈ On
6		en2sn 9108	. . . . 5 ⊢ ((𝐵 ∈ 𝐷 ∧ 1o ∈ On) → {𝐵} ≈ {1o})
7	4, 5, 6	sylancl 585	. . . 4 ⊢ (𝜑 → {𝐵} ≈ {1o})
8		enpr2dOLD.3	. . . . . 6 ⊢ (𝜑 → ¬ 𝐴 = 𝐵)
9	8	neqned 2953	. . . . 5 ⊢ (𝜑 → 𝐴 ≠ 𝐵)
10		disjsn2 4737	. . . . 5 ⊢ (𝐴 ≠ 𝐵 → ({𝐴} ∩ {𝐵}) = ∅)
11	9, 10	syl 17	. . . 4 ⊢ (𝜑 → ({𝐴} ∩ {𝐵}) = ∅)
12	5	onirri 6510	. . . . . 6 ⊢ ¬ 1o ∈ 1o
13	12	a1i 11	. . . . 5 ⊢ (𝜑 → ¬ 1o ∈ 1o)
14		disjsn 4736	. . . . 5 ⊢ ((1o ∩ {1o}) = ∅ ↔ ¬ 1o ∈ 1o)
15	13, 14	sylibr 234	. . . 4 ⊢ (𝜑 → (1o ∩ {1o}) = ∅)
16		unen 9114	. . . 4 ⊢ ((({𝐴} ≈ 1o ∧ {𝐵} ≈ {1o}) ∧ (({𝐴} ∩ {𝐵}) = ∅ ∧ (1o ∩ {1o}) = ∅)) → ({𝐴} ∪ {𝐵}) ≈ (1o ∪ {1o}))
17	3, 7, 11, 15, 16	syl22anc 838	. . 3 ⊢ (𝜑 → ({𝐴} ∪ {𝐵}) ≈ (1o ∪ {1o}))
18		df-pr 4651	. . 3 ⊢ {𝐴, 𝐵} = ({𝐴} ∪ {𝐵})
19		df-suc 6403	. . 3 ⊢ suc 1o = (1o ∪ {1o})
20	17, 18, 19	3brtr4g 5200	. 2 ⊢ (𝜑 → {𝐴, 𝐵} ≈ suc 1o)
21		df-2o 8525	. 2 ⊢ 2o = suc 1o
22	20, 21	breqtrrdi 5208	1 ⊢ (𝜑 → {𝐴, 𝐵} ≈ 2o)

Syntax hints:  ¬ wn 3   → wi 4   = wceq 1537   ∈ wcel 2108   ≠ wne 2946   ∪ cun 3974   ∩ cin 3975  ∅c0 4352  {csn 4648  {cpr 4650   class class class wbr 5166  Oncon0 6397  suc csuc 6399  1_oc1o 8517  2_oc2o 8518   ≈ cen 9002

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1793  ax-4 1807  ax-5 1909  ax-6 1967  ax-7 2007  ax-8 2110  ax-9 2118  ax-10 2141  ax-12 2178  ax-ext 2711  ax-sep 5317  ax-nul 5324  ax-pr 5447  ax-un 7772

This theorem depends on definitions:  df-bi 207  df-an 396  df-or 847  df-3or 1088  df-3an 1089  df-tru 1540  df-fal 1550  df-ex 1778  df-nf 1782  df-sb 2065  df-mo 2543  df-clab 2718  df-cleq 2732  df-clel 2819  df-ne 2947  df-ral 3068  df-rex 3077  df-rab 3444  df-v 3490  df-dif 3979  df-un 3981  df-in 3983  df-ss 3993  df-pss 3996  df-nul 4353  df-if 4549  df-pw 4624  df-sn 4649  df-pr 4651  df-op 4655  df-uni 4932  df-br 5167  df-opab 5229  df-tr 5284  df-id 5593  df-eprel 5599  df-po 5607  df-so 5608  df-fr 5652  df-we 5654  df-xp 5706  df-rel 5707  df-cnv 5708  df-co 5709  df-dm 5710  df-rn 5711  df-ord 6400  df-on 6401  df-suc 6403  df-fun 6577  df-fn 6578  df-f 6579  df-f1 6580  df-fo 6581  df-f1o 6582  df-1o 8524  df-2o 8525  df-en 9006

This theorem is referenced by: (None)