Theorem norec2ov 28400

Description: The value of the double-recursion surreal function. (Contributed by Scott Fenton, 20-Aug-2024.)

Hypothesis

Ref	Expression
norec2.1	⊢ 𝐹 = norec2 (𝐺)

Assertion

Ref	Expression
norec2ov	⊢ ((𝐴 ∈ No ∧ 𝐵 ∈ No) → (𝐴𝐹𝐵) = (⟨𝐴, 𝐵⟩𝐺(𝐹 ↾ (((((L‘𝐴) ∪ (R‘𝐴)) ∪ {𝐴}) × (((L‘𝐵) ∪ (R‘𝐵)) ∪ {𝐵})) ∖ {⟨𝐴, 𝐵⟩}))))

Proof of Theorem norec2ov

Dummy variables 𝑎 𝑏 𝑐 𝑑 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		df-ov 7454	. . 3 ⊢ (𝐴𝐹𝐵) = (𝐹‘⟨𝐴, 𝐵⟩)
2		opelxp 5694	. . . 4 ⊢ (⟨𝐴, 𝐵⟩ ∈ (No × No) ↔ (𝐴 ∈ No ∧ 𝐵 ∈ No))
3		eqid 2763	. . . . . . 7 ⊢ {⟨𝑐, 𝑑⟩ ∣ 𝑐 ∈ ((L‘𝑑) ∪ (R‘𝑑))} = {⟨𝑐, 𝑑⟩ ∣ 𝑐 ∈ ((L‘𝑑) ∪ (R‘𝑑))}
4		eqid 2763	. . . . . . 7 ⊢ {⟨𝑎, 𝑏⟩ ∣ (𝑎 ∈ (No × No) ∧ 𝑏 ∈ (No × No) ∧ (((1st ‘𝑎){⟨𝑐, 𝑑⟩ ∣ 𝑐 ∈ ((L‘𝑑) ∪ (R‘𝑑))} (1st ‘𝑏) ∨ (1st ‘𝑎) = (1st ‘𝑏)) ∧ ((2nd ‘𝑎){⟨𝑐, 𝑑⟩ ∣ 𝑐 ∈ ((L‘𝑑) ∪ (R‘𝑑))} (2nd ‘𝑏) ∨ (2nd ‘𝑎) = (2nd ‘𝑏)) ∧ 𝑎 ≠ 𝑏))} = {⟨𝑎, 𝑏⟩ ∣ (𝑎 ∈ (No × No) ∧ 𝑏 ∈ (No × No) ∧ (((1st ‘𝑎){⟨𝑐, 𝑑⟩ ∣ 𝑐 ∈ ((L‘𝑑) ∪ (R‘𝑑))} (1st ‘𝑏) ∨ (1st ‘𝑎) = (1st ‘𝑏)) ∧ ((2nd ‘𝑎){⟨𝑐, 𝑑⟩ ∣ 𝑐 ∈ ((L‘𝑑) ∪ (R‘𝑑))} (2nd ‘𝑏) ∨ (2nd ‘𝑎) = (2nd ‘𝑏)) ∧ 𝑎 ≠ 𝑏))}
5	3, 4	noxpordfr 28394	. . . . . 6 ⊢ {⟨𝑎, 𝑏⟩ ∣ (𝑎 ∈ (No × No) ∧ 𝑏 ∈ (No × No) ∧ (((1st ‘𝑎){⟨𝑐, 𝑑⟩ ∣ 𝑐 ∈ ((L‘𝑑) ∪ (R‘𝑑))} (1st ‘𝑏) ∨ (1st ‘𝑎) = (1st ‘𝑏)) ∧ ((2nd ‘𝑎){⟨𝑐, 𝑑⟩ ∣ 𝑐 ∈ ((L‘𝑑) ∪ (R‘𝑑))} (2nd ‘𝑏) ∨ (2nd ‘𝑎) = (2nd ‘𝑏)) ∧ 𝑎 ≠ 𝑏))} Fr (No × No)
6	3, 4	noxpordpo 28393	. . . . . 6 ⊢ {⟨𝑎, 𝑏⟩ ∣ (𝑎 ∈ (No × No) ∧ 𝑏 ∈ (No × No) ∧ (((1st ‘𝑎){⟨𝑐, 𝑑⟩ ∣ 𝑐 ∈ ((L‘𝑑) ∪ (R‘𝑑))} (1st ‘𝑏) ∨ (1st ‘𝑎) = (1st ‘𝑏)) ∧ ((2nd ‘𝑎){⟨𝑐, 𝑑⟩ ∣ 𝑐 ∈ ((L‘𝑑) ∪ (R‘𝑑))} (2nd ‘𝑏) ∨ (2nd ‘𝑎) = (2nd ‘𝑏)) ∧ 𝑎 ≠ 𝑏))} Po (No × No)
7	3, 4	noxpordse 28395	. . . . . 6 ⊢ {⟨𝑎, 𝑏⟩ ∣ (𝑎 ∈ (No × No) ∧ 𝑏 ∈ (No × No) ∧ (((1st ‘𝑎){⟨𝑐, 𝑑⟩ ∣ 𝑐 ∈ ((L‘𝑑) ∪ (R‘𝑑))} (1st ‘𝑏) ∨ (1st ‘𝑎) = (1st ‘𝑏)) ∧ ((2nd ‘𝑎){⟨𝑐, 𝑑⟩ ∣ 𝑐 ∈ ((L‘𝑑) ∪ (R‘𝑑))} (2nd ‘𝑏) ∨ (2nd ‘𝑎) = (2nd ‘𝑏)) ∧ 𝑎 ≠ 𝑏))} Se (No × No)
8	5, 6, 7	3pm3.2i 1358	. . . . 5 ⊢ ({⟨𝑎, 𝑏⟩ ∣ (𝑎 ∈ (No × No) ∧ 𝑏 ∈ (No × No) ∧ (((1st ‘𝑎){⟨𝑐, 𝑑⟩ ∣ 𝑐 ∈ ((L‘𝑑) ∪ (R‘𝑑))} (1st ‘𝑏) ∨ (1st ‘𝑎) = (1st ‘𝑏)) ∧ ((2nd ‘𝑎){⟨𝑐, 𝑑⟩ ∣ 𝑐 ∈ ((L‘𝑑) ∪ (R‘𝑑))} (2nd ‘𝑏) ∨ (2nd ‘𝑎) = (2nd ‘𝑏)) ∧ 𝑎 ≠ 𝑏))} Fr (No × No) ∧ {⟨𝑎, 𝑏⟩ ∣ (𝑎 ∈ (No × No) ∧ 𝑏 ∈ (No × No) ∧ (((1st ‘𝑎){⟨𝑐, 𝑑⟩ ∣ 𝑐 ∈ ((L‘𝑑) ∪ (R‘𝑑))} (1st ‘𝑏) ∨ (1st ‘𝑎) = (1st ‘𝑏)) ∧ ((2nd ‘𝑎){⟨𝑐, 𝑑⟩ ∣ 𝑐 ∈ ((L‘𝑑) ∪ (R‘𝑑))} (2nd ‘𝑏) ∨ (2nd ‘𝑎) = (2nd ‘𝑏)) ∧ 𝑎 ≠ 𝑏))} Po (No × No) ∧ {⟨𝑎, 𝑏⟩ ∣ (𝑎 ∈ (No × No) ∧ 𝑏 ∈ (No × No) ∧ (((1st ‘𝑎){⟨𝑐, 𝑑⟩ ∣ 𝑐 ∈ ((L‘𝑑) ∪ (R‘𝑑))} (1st ‘𝑏) ∨ (1st ‘𝑎) = (1st ‘𝑏)) ∧ ((2nd ‘𝑎){⟨𝑐, 𝑑⟩ ∣ 𝑐 ∈ ((L‘𝑑) ∪ (R‘𝑑))} (2nd ‘𝑏) ∨ (2nd ‘𝑎) = (2nd ‘𝑏)) ∧ 𝑎 ≠ 𝑏))} Se (No × No))
9		norec2.1	. . . . . . 7 ⊢ 𝐹 = norec2 (𝐺)
10		df-norec2 28392	. . . . . . 7 ⊢ norec2 (𝐺) = frecs({⟨𝑎, 𝑏⟩ ∣ (𝑎 ∈ (No × No) ∧ 𝑏 ∈ (No × No) ∧ (((1st ‘𝑎){⟨𝑐, 𝑑⟩ ∣ 𝑐 ∈ ((L‘𝑑) ∪ (R‘𝑑))} (1st ‘𝑏) ∨ (1st ‘𝑎) = (1st ‘𝑏)) ∧ ((2nd ‘𝑎){⟨𝑐, 𝑑⟩ ∣ 𝑐 ∈ ((L‘𝑑) ∪ (R‘𝑑))} (2nd ‘𝑏) ∨ (2nd ‘𝑎) = (2nd ‘𝑏)) ∧ 𝑎 ≠ 𝑏))}, (No × No), 𝐺)
11	9, 10	eqtri 2786	. . . . . 6 ⊢ 𝐹 = frecs({⟨𝑎, 𝑏⟩ ∣ (𝑎 ∈ (No × No) ∧ 𝑏 ∈ (No × No) ∧ (((1st ‘𝑎){⟨𝑐, 𝑑⟩ ∣ 𝑐 ∈ ((L‘𝑑) ∪ (R‘𝑑))} (1st ‘𝑏) ∨ (1st ‘𝑎) = (1st ‘𝑏)) ∧ ((2nd ‘𝑎){⟨𝑐, 𝑑⟩ ∣ 𝑐 ∈ ((L‘𝑑) ∪ (R‘𝑑))} (2nd ‘𝑏) ∨ (2nd ‘𝑎) = (2nd ‘𝑏)) ∧ 𝑎 ≠ 𝑏))}, (No × No), 𝐺)
12	11	fpr2 8360	. . . . 5 ⊢ ((({⟨𝑎, 𝑏⟩ ∣ (𝑎 ∈ (No × No) ∧ 𝑏 ∈ (No × No) ∧ (((1st ‘𝑎){⟨𝑐, 𝑑⟩ ∣ 𝑐 ∈ ((L‘𝑑) ∪ (R‘𝑑))} (1st ‘𝑏) ∨ (1st ‘𝑎) = (1st ‘𝑏)) ∧ ((2nd ‘𝑎){⟨𝑐, 𝑑⟩ ∣ 𝑐 ∈ ((L‘𝑑) ∪ (R‘𝑑))} (2nd ‘𝑏) ∨ (2nd ‘𝑎) = (2nd ‘𝑏)) ∧ 𝑎 ≠ 𝑏))} Fr (No × No) ∧ {⟨𝑎, 𝑏⟩ ∣ (𝑎 ∈ (No × No) ∧ 𝑏 ∈ (No × No) ∧ (((1st ‘𝑎){⟨𝑐, 𝑑⟩ ∣ 𝑐 ∈ ((L‘𝑑) ∪ (R‘𝑑))} (1st ‘𝑏) ∨ (1st ‘𝑎) = (1st ‘𝑏)) ∧ ((2nd ‘𝑎){⟨𝑐, 𝑑⟩ ∣ 𝑐 ∈ ((L‘𝑑) ∪ (R‘𝑑))} (2nd ‘𝑏) ∨ (2nd ‘𝑎) = (2nd ‘𝑏)) ∧ 𝑎 ≠ 𝑏))} Po (No × No) ∧ {⟨𝑎, 𝑏⟩ ∣ (𝑎 ∈ (No × No) ∧ 𝑏 ∈ (No × No) ∧ (((1st ‘𝑎){⟨𝑐, 𝑑⟩ ∣ 𝑐 ∈ ((L‘𝑑) ∪ (R‘𝑑))} (1st ‘𝑏) ∨ (1st ‘𝑎) = (1st ‘𝑏)) ∧ ((2nd ‘𝑎){⟨𝑐, 𝑑⟩ ∣ 𝑐 ∈ ((L‘𝑑) ∪ (R‘𝑑))} (2nd ‘𝑏) ∨ (2nd ‘𝑎) = (2nd ‘𝑏)) ∧ 𝑎 ≠ 𝑏))} Se (No × No)) ∧ ⟨𝐴, 𝐵⟩ ∈ (No × No)) → (𝐹‘⟨𝐴, 𝐵⟩) = (⟨𝐴, 𝐵⟩𝐺(𝐹 ↾ Pred({⟨𝑎, 𝑏⟩ ∣ (𝑎 ∈ (No × No) ∧ 𝑏 ∈ (No × No) ∧ (((1st ‘𝑎){⟨𝑐, 𝑑⟩ ∣ 𝑐 ∈ ((L‘𝑑) ∪ (R‘𝑑))} (1st ‘𝑏) ∨ (1st ‘𝑎) = (1st ‘𝑏)) ∧ ((2nd ‘𝑎){⟨𝑐, 𝑑⟩ ∣ 𝑐 ∈ ((L‘𝑑) ∪ (R‘𝑑))} (2nd ‘𝑏) ∨ (2nd ‘𝑎) = (2nd ‘𝑏)) ∧ 𝑎 ≠ 𝑏))}, (No × No), ⟨𝐴, 𝐵⟩))))
13	8, 12	mpan 703	. . . 4 ⊢ (⟨𝐴, 𝐵⟩ ∈ (No × No) → (𝐹‘⟨𝐴, 𝐵⟩) = (⟨𝐴, 𝐵⟩𝐺(𝐹 ↾ Pred({⟨𝑎, 𝑏⟩ ∣ (𝑎 ∈ (No × No) ∧ 𝑏 ∈ (No × No) ∧ (((1st ‘𝑎){⟨𝑐, 𝑑⟩ ∣ 𝑐 ∈ ((L‘𝑑) ∪ (R‘𝑑))} (1st ‘𝑏) ∨ (1st ‘𝑎) = (1st ‘𝑏)) ∧ ((2nd ‘𝑎){⟨𝑐, 𝑑⟩ ∣ 𝑐 ∈ ((L‘𝑑) ∪ (R‘𝑑))} (2nd ‘𝑏) ∨ (2nd ‘𝑎) = (2nd ‘𝑏)) ∧ 𝑎 ≠ 𝑏))}, (No × No), ⟨𝐴, 𝐵⟩))))
14	2, 13	sylbir 238	. . 3 ⊢ ((𝐴 ∈ No ∧ 𝐵 ∈ No) → (𝐹‘⟨𝐴, 𝐵⟩) = (⟨𝐴, 𝐵⟩𝐺(𝐹 ↾ Pred({⟨𝑎, 𝑏⟩ ∣ (𝑎 ∈ (No × No) ∧ 𝑏 ∈ (No × No) ∧ (((1st ‘𝑎){⟨𝑐, 𝑑⟩ ∣ 𝑐 ∈ ((L‘𝑑) ∪ (R‘𝑑))} (1st ‘𝑏) ∨ (1st ‘𝑎) = (1st ‘𝑏)) ∧ ((2nd ‘𝑎){⟨𝑐, 𝑑⟩ ∣ 𝑐 ∈ ((L‘𝑑) ∪ (R‘𝑑))} (2nd ‘𝑏) ∨ (2nd ‘𝑎) = (2nd ‘𝑏)) ∧ 𝑎 ≠ 𝑏))}, (No × No), ⟨𝐴, 𝐵⟩))))
15	1, 14	eqtrid 2810	. 2 ⊢ ((𝐴 ∈ No ∧ 𝐵 ∈ No) → (𝐴𝐹𝐵) = (⟨𝐴, 𝐵⟩𝐺(𝐹 ↾ Pred({⟨𝑎, 𝑏⟩ ∣ (𝑎 ∈ (No × No) ∧ 𝑏 ∈ (No × No) ∧ (((1st ‘𝑎){⟨𝑐, 𝑑⟩ ∣ 𝑐 ∈ ((L‘𝑑) ∪ (R‘𝑑))} (1st ‘𝑏) ∨ (1st ‘𝑎) = (1st ‘𝑏)) ∧ ((2nd ‘𝑎){⟨𝑐, 𝑑⟩ ∣ 𝑐 ∈ ((L‘𝑑) ∪ (R‘𝑑))} (2nd ‘𝑏) ∨ (2nd ‘𝑎) = (2nd ‘𝑏)) ∧ 𝑎 ≠ 𝑏))}, (No × No), ⟨𝐴, 𝐵⟩))))
16	3, 4	noxpordpred 28396	. . . 4 ⊢ ((𝐴 ∈ No ∧ 𝐵 ∈ No) → Pred({⟨𝑎, 𝑏⟩ ∣ (𝑎 ∈ (No × No) ∧ 𝑏 ∈ (No × No) ∧ (((1st ‘𝑎){⟨𝑐, 𝑑⟩ ∣ 𝑐 ∈ ((L‘𝑑) ∪ (R‘𝑑))} (1st ‘𝑏) ∨ (1st ‘𝑎) = (1st ‘𝑏)) ∧ ((2nd ‘𝑎){⟨𝑐, 𝑑⟩ ∣ 𝑐 ∈ ((L‘𝑑) ∪ (R‘𝑑))} (2nd ‘𝑏) ∨ (2nd ‘𝑎) = (2nd ‘𝑏)) ∧ 𝑎 ≠ 𝑏))}, (No × No), ⟨𝐴, 𝐵⟩) = (((((L‘𝐴) ∪ (R‘𝐴)) ∪ {𝐴}) × (((L‘𝐵) ∪ (R‘𝐵)) ∪ {𝐵})) ∖ {⟨𝐴, 𝐵⟩}))
17	16	reseq2d 5986	. . 3 ⊢ ((𝐴 ∈ No ∧ 𝐵 ∈ No) → (𝐹 ↾ Pred({⟨𝑎, 𝑏⟩ ∣ (𝑎 ∈ (No × No) ∧ 𝑏 ∈ (No × No) ∧ (((1st ‘𝑎){⟨𝑐, 𝑑⟩ ∣ 𝑐 ∈ ((L‘𝑑) ∪ (R‘𝑑))} (1st ‘𝑏) ∨ (1st ‘𝑎) = (1st ‘𝑏)) ∧ ((2nd ‘𝑎){⟨𝑐, 𝑑⟩ ∣ 𝑐 ∈ ((L‘𝑑) ∪ (R‘𝑑))} (2nd ‘𝑏) ∨ (2nd ‘𝑎) = (2nd ‘𝑏)) ∧ 𝑎 ≠ 𝑏))}, (No × No), ⟨𝐴, 𝐵⟩)) = (𝐹 ↾ (((((L‘𝐴) ∪ (R‘𝐴)) ∪ {𝐴}) × (((L‘𝐵) ∪ (R‘𝐵)) ∪ {𝐵})) ∖ {⟨𝐴, 𝐵⟩})))
18	17	oveq2d 7467	. 2 ⊢ ((𝐴 ∈ No ∧ 𝐵 ∈ No) → (⟨𝐴, 𝐵⟩𝐺(𝐹 ↾ Pred({⟨𝑎, 𝑏⟩ ∣ (𝑎 ∈ (No × No) ∧ 𝑏 ∈ (No × No) ∧ (((1st ‘𝑎){⟨𝑐, 𝑑⟩ ∣ 𝑐 ∈ ((L‘𝑑) ∪ (R‘𝑑))} (1st ‘𝑏) ∨ (1st ‘𝑎) = (1st ‘𝑏)) ∧ ((2nd ‘𝑎){⟨𝑐, 𝑑⟩ ∣ 𝑐 ∈ ((L‘𝑑) ∪ (R‘𝑑))} (2nd ‘𝑏) ∨ (2nd ‘𝑎) = (2nd ‘𝑏)) ∧ 𝑎 ≠ 𝑏))}, (No × No), ⟨𝐴, 𝐵⟩))) = (⟨𝐴, 𝐵⟩𝐺(𝐹 ↾ (((((L‘𝐴) ∪ (R‘𝐴)) ∪ {𝐴}) × (((L‘𝐵) ∪ (R‘𝐵)) ∪ {𝐵})) ∖ {⟨𝐴, 𝐵⟩}))))
19	15, 18	eqtrd 2798	1 ⊢ ((𝐴 ∈ No ∧ 𝐵 ∈ No) → (𝐴𝐹𝐵) = (⟨𝐴, 𝐵⟩𝐺(𝐹 ↾ (((((L‘𝐴) ∪ (R‘𝐴)) ∪ {𝐴}) × (((L‘𝐵) ∪ (R‘𝐵)) ∪ {𝐵})) ∖ {⟨𝐴, 𝐵⟩}))))

This proof depends on syntax axioms:   → wi 4   ∧ wa 401   ∨ wo 861   ∧ w3a 1103   = wceq 1570   ∈ wcel 2147   ≠ wne 2959   ∖ cdif 4048   ∪ cun 4152  {csn 4588  ⟨cop 4840   class class class wbr 5108  {copab 5173   Po wpo 5564   Fr wfr 5608   Se wse 5609   × cxp 5656   ↾ cres 5660  Predcpred 6329  ‘cfv 6566  (class class class)co 7451  1^st c1st 8033  2^nd c2nd 8034  frecscfrecs 8336  Nocsur 28054  Lcleft 28268  Rcright 28269   norec2 cnorec2 28391

This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1828  ax-4 1842  ax-5 1945  ax-6 2002  ax-7 2043  ax-8 2149  ax-9 2157  ax-10 2180  ax-11 2197  ax-12 2216  ax-ext 2735  ax-rep 5238  ax-sep 5255  ax-nul 5266  ax-pow 5334  ax-pr 5398  ax-un 7783

This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3or 1104  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1813  df-nf 1817  df-sb 2102  df-mo 2567  df-eu 2597  df-clab 2742  df-cleq 2755  df-clel 2839  df-nfc 2913  df-ne 2960  df-ral 3081  df-rex 3091  df-rmo 3369  df-reu 3370  df-rab 3417  df-v 3456  df-sbc 3743  df-csb 3852  df-ss 3901  df-pss 4017  df-dif 4050  df-in 4094  df-un 4154  df-nul 4282  df-if 4486  df-pw 4562  df-sn 4589  df-pr 4591  df-tp 4593  df-op 4841  df-uni 4873  df-int 4913  df-iun 4958  df-br 5109  df-opab 5174  df-mpt 5193  df-tr 5219  df-id 5553  df-eprel 5558  df-po 5566  df-so 5567  df-fr 5611  df-se 5612  df-we 5613  df-xp 5664  df-rel 5665  df-cnv 5666  df-co 5667  df-dm 5668  df-rn 5669  df-res 5670  df-ima 5671  df-pred 6330  df-ord 6391  df-on 6392  df-suc 6394  df-iota 6520  df-fun 6568  df-fn 6569  df-f 6570  df-f1 6571  df-fo 6572  df-f1o 6573  df-fv 6574  df-riota 7408  df-ov 7454  df-oprab 7455  df-mpo 7456  df-1st 8035  df-2nd 8036  df-frecs 8337  df-wrecs 8368  df-recs 8417  df-1o 8514  df-2o 8515  df-no 28057  df-lts 28058  df-bday 28059  df-slts 28201  df-cuts 28203  df-made 28270  df-old 28271  df-left 28273  df-right 28274  df-norec2 28392

This theorem is used by:  addsval  28405  mulsval  28552