Theorem seqom0g 8092

Description: Value of an index-aware recursive definition at 0. (Contributed by Stefan O'Rear, 1-Nov-2014.) (Revised by AV, 17-Sep-2021.)

Hypothesis

Ref	Expression
seqom.a	⊢ 𝐺 = seqω(𝐹, 𝐼)

Assertion

Ref	Expression
seqom0g	⊢ (𝐼 ∈ 𝑉 → (𝐺‘∅) = 𝐼)

Proof of Theorem seqom0g

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

Step	Hyp	Ref	Expression
1		seqom.a	. . . . 5 ⊢ 𝐺 = seqω(𝐹, 𝐼)
2		df-seqom 8084	. . . . 5 ⊢ seqω(𝐹, 𝐼) = (rec((𝑎 ∈ ω, 𝑏 ∈ V ↦ ⟨suc 𝑎, (𝑎𝐹𝑏)⟩), ⟨∅, ( I ‘𝐼)⟩) “ ω)
3	1, 2	eqtri 2844	. . . 4 ⊢ 𝐺 = (rec((𝑎 ∈ ω, 𝑏 ∈ V ↦ ⟨suc 𝑎, (𝑎𝐹𝑏)⟩), ⟨∅, ( I ‘𝐼)⟩) “ ω)
4	3	fveq1i 6671	. . 3 ⊢ (𝐺‘∅) = ((rec((𝑎 ∈ ω, 𝑏 ∈ V ↦ ⟨suc 𝑎, (𝑎𝐹𝑏)⟩), ⟨∅, ( I ‘𝐼)⟩) “ ω)‘∅)
5		seqomlem0 8085	. . . 4 ⊢ rec((𝑎 ∈ ω, 𝑏 ∈ V ↦ ⟨suc 𝑎, (𝑎𝐹𝑏)⟩), ⟨∅, ( I ‘𝐼)⟩) = rec((𝑐 ∈ ω, 𝑑 ∈ V ↦ ⟨suc 𝑐, (𝑐𝐹𝑑)⟩), ⟨∅, ( I ‘𝐼)⟩)
6	5	seqomlem3 8088	. . 3 ⊢ ((rec((𝑎 ∈ ω, 𝑏 ∈ V ↦ ⟨suc 𝑎, (𝑎𝐹𝑏)⟩), ⟨∅, ( I ‘𝐼)⟩) “ ω)‘∅) = ( I ‘𝐼)
7	4, 6	eqtri 2844	. 2 ⊢ (𝐺‘∅) = ( I ‘𝐼)
8		fvi 6740	. 2 ⊢ (𝐼 ∈ 𝑉 → ( I ‘𝐼) = 𝐼)
9	7, 8	syl5eq 2868	1 ⊢ (𝐼 ∈ 𝑉 → (𝐺‘∅) = 𝐼)

Syntax hints:   → wi 4   = wceq 1537   ∈ wcel 2114  Vcvv 3494  ∅c0 4291  ⟨cop 4573   I cid 5459   “ cima 5558  suc csuc 6193  ‘cfv 6355  (class class class)co 7156   ∈ cmpo 7158  ωcom 7580  reccrdg 8045  seq_ωcseqom 8083

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1796  ax-4 1810  ax-5 1911  ax-6 1970  ax-7 2015  ax-8 2116  ax-9 2124  ax-10 2145  ax-11 2161  ax-12 2177  ax-ext 2793  ax-sep 5203  ax-nul 5210  ax-pow 5266  ax-pr 5330  ax-un 7461

This theorem depends on definitions:  df-bi 209  df-an 399  df-or 844  df-3or 1084  df-3an 1085  df-tru 1540  df-ex 1781  df-nf 1785  df-sb 2070  df-mo 2622  df-eu 2654  df-clab 2800  df-cleq 2814  df-clel 2893  df-nfc 2963  df-ne 3017  df-ral 3143  df-rex 3144  df-reu 3145  df-rab 3147  df-v 3496  df-sbc 3773  df-csb 3884  df-dif 3939  df-un 3941  df-in 3943  df-ss 3952  df-pss 3954  df-nul 4292  df-if 4468  df-pw 4541  df-sn 4568  df-pr 4570  df-tp 4572  df-op 4574  df-uni 4839  df-iun 4921  df-br 5067  df-opab 5129  df-mpt 5147  df-tr 5173  df-id 5460  df-eprel 5465  df-po 5474  df-so 5475  df-fr 5514  df-we 5516  df-xp 5561  df-rel 5562  df-cnv 5563  df-co 5564  df-dm 5565  df-rn 5566  df-res 5567  df-ima 5568  df-pred 6148  df-ord 6194  df-on 6195  df-lim 6196  df-suc 6197  df-iota 6314  df-fun 6357  df-fn 6358  df-f 6359  df-f1 6360  df-fo 6361  df-f1o 6362  df-fv 6363  df-ov 7159  df-oprab 7160  df-mpo 7161  df-om 7581  df-2nd 7690  df-wrecs 7947  df-recs 8008  df-rdg 8046  df-seqom 8084

This theorem is referenced by:  cantnfvalf  9128  cantnfval2  9132  cantnflt  9135  cantnff  9137  cantnf0  9138  cantnfp1lem3  9143  cantnf  9156  cnfcom  9163  fseqenlem1  9450  fin23lem14  9755  fin23lem16  9757