Theorem seqom0g 7943

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 7935	. . . . 5 ⊢ seq𝜔(𝐹, 𝐼) = (rec((𝑎 ∈ ω, 𝑏 ∈ V ↦ ⟨suc 𝑎, (𝑎𝐹𝑏)⟩), ⟨∅, ( I ‘𝐼)⟩) “ ω)
3	1, 2	eqtri 2819	. . . 4 ⊢ 𝐺 = (rec((𝑎 ∈ ω, 𝑏 ∈ V ↦ ⟨suc 𝑎, (𝑎𝐹𝑏)⟩), ⟨∅, ( I ‘𝐼)⟩) “ ω)
4	3	fveq1i 6539	. . 3 ⊢ (𝐺‘∅) = ((rec((𝑎 ∈ ω, 𝑏 ∈ V ↦ ⟨suc 𝑎, (𝑎𝐹𝑏)⟩), ⟨∅, ( I ‘𝐼)⟩) “ ω)‘∅)
5		seqomlem0 7936	. . . 4 ⊢ rec((𝑎 ∈ ω, 𝑏 ∈ V ↦ ⟨suc 𝑎, (𝑎𝐹𝑏)⟩), ⟨∅, ( I ‘𝐼)⟩) = rec((𝑐 ∈ ω, 𝑑 ∈ V ↦ ⟨suc 𝑐, (𝑐𝐹𝑑)⟩), ⟨∅, ( I ‘𝐼)⟩)
6	5	seqomlem3 7939	. . 3 ⊢ ((rec((𝑎 ∈ ω, 𝑏 ∈ V ↦ ⟨suc 𝑎, (𝑎𝐹𝑏)⟩), ⟨∅, ( I ‘𝐼)⟩) “ ω)‘∅) = ( I ‘𝐼)
7	4, 6	eqtri 2819	. 2 ⊢ (𝐺‘∅) = ( I ‘𝐼)
8		fvi 6607	. 2 ⊢ (𝐼 ∈ 𝑉 → ( I ‘𝐼) = 𝐼)
9	7, 8	syl5eq 2843	1 ⊢ (𝐼 ∈ 𝑉 → (𝐺‘∅) = 𝐼)

Syntax hints:   → wi 4   = wceq 1522   ∈ wcel 2081  Vcvv 3437  ∅c0 4211  ⟨cop 4478   I cid 5347   “ cima 5446  suc csuc 6068  ‘cfv 6225  (class class class)co 7016   ∈ cmpo 7018  ωcom 7436  reccrdg 7897  seq_𝜔cseqom 7934

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1777  ax-4 1791  ax-5 1888  ax-6 1947  ax-7 1992  ax-8 2083  ax-9 2091  ax-10 2112  ax-11 2126  ax-12 2141  ax-13 2344  ax-ext 2769  ax-sep 5094  ax-nul 5101  ax-pow 5157  ax-pr 5221  ax-un 7319

This theorem depends on definitions:  df-bi 208  df-an 397  df-or 843  df-3or 1081  df-3an 1082  df-tru 1525  df-ex 1762  df-nf 1766  df-sb 2043  df-mo 2576  df-eu 2612  df-clab 2776  df-cleq 2788  df-clel 2863  df-nfc 2935  df-ne 2985  df-ral 3110  df-rex 3111  df-reu 3112  df-rab 3114  df-v 3439  df-sbc 3707  df-csb 3812  df-dif 3862  df-un 3864  df-in 3866  df-ss 3874  df-pss 3876  df-nul 4212  df-if 4382  df-pw 4455  df-sn 4473  df-pr 4475  df-tp 4477  df-op 4479  df-uni 4746  df-iun 4827  df-br 4963  df-opab 5025  df-mpt 5042  df-tr 5064  df-id 5348  df-eprel 5353  df-po 5362  df-so 5363  df-fr 5402  df-we 5404  df-xp 5449  df-rel 5450  df-cnv 5451  df-co 5452  df-dm 5453  df-rn 5454  df-res 5455  df-ima 5456  df-pred 6023  df-ord 6069  df-on 6070  df-lim 6071  df-suc 6072  df-iota 6189  df-fun 6227  df-fn 6228  df-f 6229  df-f1 6230  df-fo 6231  df-f1o 6232  df-fv 6233  df-ov 7019  df-oprab 7020  df-mpo 7021  df-om 7437  df-2nd 7546  df-wrecs 7798  df-recs 7860  df-rdg 7898  df-seqom 7935

This theorem is referenced by:  cantnfvalf  8974  cantnfval2  8978  cantnflt  8981  cantnff  8983  cantnf0  8984  cantnfp1lem3  8989  cantnf  9002  cnfcom  9009  fseqenlem1  9296  fin23lem14  9601  fin23lem16  9603