Theorem efgtlen 17962

Description: Value of the free group construction. (Contributed by Mario Carneiro, 27-Sep-2015.)

Hypotheses

Ref	Expression
efgval.w	⊢ 𝑊 = ( I ‘Word (𝐼 × 2𝑜))
efgval.r	⊢ ∼ = ( ~FG ‘𝐼)
efgval2.m	⊢ 𝑀 = (𝑦 ∈ 𝐼, 𝑧 ∈ 2𝑜 ↦ ⟨𝑦, (1𝑜 ∖ 𝑧)⟩)
efgval2.t	⊢ 𝑇 = (𝑣 ∈ 𝑊 ↦ (𝑛 ∈ (0...(#‘𝑣)), 𝑤 ∈ (𝐼 × 2𝑜) ↦ (𝑣 splice ⟨𝑛, 𝑛, ⟨“𝑤(𝑀‘𝑤)”⟩⟩)))

Assertion

Ref	Expression
efgtlen	⊢ ((𝑋 ∈ 𝑊 ∧ 𝐴 ∈ ran (𝑇‘𝑋)) → (#‘𝐴) = ((#‘𝑋) + 2))

Distinct variable groups:   𝑦,𝑧   𝑣,𝑛,𝑤,𝑦,𝑧   𝑛,𝑀,𝑣,𝑤   𝑛,𝑊,𝑣,𝑤,𝑦,𝑧   𝑦, ∼ ,𝑧   𝑛,𝐼,𝑣,𝑤,𝑦,𝑧

Allowed substitution hints:   𝐴(𝑦,𝑧,𝑤,𝑣,𝑛)   ∼ (𝑤,𝑣,𝑛)   𝑇(𝑦,𝑧,𝑤,𝑣,𝑛)   𝑀(𝑦,𝑧)   𝑋(𝑦,𝑧,𝑤,𝑣,𝑛)

Proof of Theorem efgtlen

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

Step	Hyp	Ref	Expression
1		efgval.w	. . . . . . . 8 ⊢ 𝑊 = ( I ‘Word (𝐼 × 2𝑜))
2		efgval.r	. . . . . . . 8 ⊢ ∼ = ( ~FG ‘𝐼)
3		efgval2.m	. . . . . . . 8 ⊢ 𝑀 = (𝑦 ∈ 𝐼, 𝑧 ∈ 2𝑜 ↦ ⟨𝑦, (1𝑜 ∖ 𝑧)⟩)
4		efgval2.t	. . . . . . . 8 ⊢ 𝑇 = (𝑣 ∈ 𝑊 ↦ (𝑛 ∈ (0...(#‘𝑣)), 𝑤 ∈ (𝐼 × 2𝑜) ↦ (𝑣 splice ⟨𝑛, 𝑛, ⟨“𝑤(𝑀‘𝑤)”⟩⟩)))
5	1, 2, 3, 4	efgtf 17958	. . . . . . 7 ⊢ (𝑋 ∈ 𝑊 → ((𝑇‘𝑋) = (𝑎 ∈ (0...(#‘𝑋)), 𝑏 ∈ (𝐼 × 2𝑜) ↦ (𝑋 splice ⟨𝑎, 𝑎, ⟨“𝑏(𝑀‘𝑏)”⟩⟩)) ∧ (𝑇‘𝑋):((0...(#‘𝑋)) × (𝐼 × 2𝑜))⟶𝑊))
6	5	simpld 474	. . . . . 6 ⊢ (𝑋 ∈ 𝑊 → (𝑇‘𝑋) = (𝑎 ∈ (0...(#‘𝑋)), 𝑏 ∈ (𝐼 × 2𝑜) ↦ (𝑋 splice ⟨𝑎, 𝑎, ⟨“𝑏(𝑀‘𝑏)”⟩⟩)))
7	6	rneqd 5274	. . . . 5 ⊢ (𝑋 ∈ 𝑊 → ran (𝑇‘𝑋) = ran (𝑎 ∈ (0...(#‘𝑋)), 𝑏 ∈ (𝐼 × 2𝑜) ↦ (𝑋 splice ⟨𝑎, 𝑎, ⟨“𝑏(𝑀‘𝑏)”⟩⟩)))
8	7	eleq2d 2673	. . . 4 ⊢ (𝑋 ∈ 𝑊 → (𝐴 ∈ ran (𝑇‘𝑋) ↔ 𝐴 ∈ ran (𝑎 ∈ (0...(#‘𝑋)), 𝑏 ∈ (𝐼 × 2𝑜) ↦ (𝑋 splice ⟨𝑎, 𝑎, ⟨“𝑏(𝑀‘𝑏)”⟩⟩))))
9		eqid 2610	. . . . 5 ⊢ (𝑎 ∈ (0...(#‘𝑋)), 𝑏 ∈ (𝐼 × 2𝑜) ↦ (𝑋 splice ⟨𝑎, 𝑎, ⟨“𝑏(𝑀‘𝑏)”⟩⟩)) = (𝑎 ∈ (0...(#‘𝑋)), 𝑏 ∈ (𝐼 × 2𝑜) ↦ (𝑋 splice ⟨𝑎, 𝑎, ⟨“𝑏(𝑀‘𝑏)”⟩⟩))
10		ovex 6577	. . . . 5 ⊢ (𝑋 splice ⟨𝑎, 𝑎, ⟨“𝑏(𝑀‘𝑏)”⟩⟩) ∈ V
11	9, 10	elrnmpt2 6671	. . . 4 ⊢ (𝐴 ∈ ran (𝑎 ∈ (0...(#‘𝑋)), 𝑏 ∈ (𝐼 × 2𝑜) ↦ (𝑋 splice ⟨𝑎, 𝑎, ⟨“𝑏(𝑀‘𝑏)”⟩⟩)) ↔ ∃𝑎 ∈ (0...(#‘𝑋))∃𝑏 ∈ (𝐼 × 2𝑜)𝐴 = (𝑋 splice ⟨𝑎, 𝑎, ⟨“𝑏(𝑀‘𝑏)”⟩⟩))
12	8, 11	syl6bb 275	. . 3 ⊢ (𝑋 ∈ 𝑊 → (𝐴 ∈ ran (𝑇‘𝑋) ↔ ∃𝑎 ∈ (0...(#‘𝑋))∃𝑏 ∈ (𝐼 × 2𝑜)𝐴 = (𝑋 splice ⟨𝑎, 𝑎, ⟨“𝑏(𝑀‘𝑏)”⟩⟩)))
13		fviss 6166	. . . . . . . . 9 ⊢ ( I ‘Word (𝐼 × 2𝑜)) ⊆ Word (𝐼 × 2𝑜)
14	1, 13	eqsstri 3598	. . . . . . . 8 ⊢ 𝑊 ⊆ Word (𝐼 × 2𝑜)
15		simpl 472	. . . . . . . 8 ⊢ ((𝑋 ∈ 𝑊 ∧ (𝑎 ∈ (0...(#‘𝑋)) ∧ 𝑏 ∈ (𝐼 × 2𝑜))) → 𝑋 ∈ 𝑊)
16	14, 15	sseldi 3566	. . . . . . 7 ⊢ ((𝑋 ∈ 𝑊 ∧ (𝑎 ∈ (0...(#‘𝑋)) ∧ 𝑏 ∈ (𝐼 × 2𝑜))) → 𝑋 ∈ Word (𝐼 × 2𝑜))
17		elfzuz 12209	. . . . . . . . 9 ⊢ (𝑎 ∈ (0...(#‘𝑋)) → 𝑎 ∈ (ℤ≥‘0))
18	17	ad2antrl 760	. . . . . . . 8 ⊢ ((𝑋 ∈ 𝑊 ∧ (𝑎 ∈ (0...(#‘𝑋)) ∧ 𝑏 ∈ (𝐼 × 2𝑜))) → 𝑎 ∈ (ℤ≥‘0))
19		eluzfz2b 12221	. . . . . . . 8 ⊢ (𝑎 ∈ (ℤ≥‘0) ↔ 𝑎 ∈ (0...𝑎))
20	18, 19	sylib 207	. . . . . . 7 ⊢ ((𝑋 ∈ 𝑊 ∧ (𝑎 ∈ (0...(#‘𝑋)) ∧ 𝑏 ∈ (𝐼 × 2𝑜))) → 𝑎 ∈ (0...𝑎))
21		simprl 790	. . . . . . 7 ⊢ ((𝑋 ∈ 𝑊 ∧ (𝑎 ∈ (0...(#‘𝑋)) ∧ 𝑏 ∈ (𝐼 × 2𝑜))) → 𝑎 ∈ (0...(#‘𝑋)))
22		simprr 792	. . . . . . . 8 ⊢ ((𝑋 ∈ 𝑊 ∧ (𝑎 ∈ (0...(#‘𝑋)) ∧ 𝑏 ∈ (𝐼 × 2𝑜))) → 𝑏 ∈ (𝐼 × 2𝑜))
23	3	efgmf 17949	. . . . . . . . . 10 ⊢ 𝑀:(𝐼 × 2𝑜)⟶(𝐼 × 2𝑜)
24	23	ffvelrni 6266	. . . . . . . . 9 ⊢ (𝑏 ∈ (𝐼 × 2𝑜) → (𝑀‘𝑏) ∈ (𝐼 × 2𝑜))
25	22, 24	syl 17	. . . . . . . 8 ⊢ ((𝑋 ∈ 𝑊 ∧ (𝑎 ∈ (0...(#‘𝑋)) ∧ 𝑏 ∈ (𝐼 × 2𝑜))) → (𝑀‘𝑏) ∈ (𝐼 × 2𝑜))
26	22, 25	s2cld 13466	. . . . . . 7 ⊢ ((𝑋 ∈ 𝑊 ∧ (𝑎 ∈ (0...(#‘𝑋)) ∧ 𝑏 ∈ (𝐼 × 2𝑜))) → ⟨“𝑏(𝑀‘𝑏)”⟩ ∈ Word (𝐼 × 2𝑜))
27	16, 20, 21, 26	spllen 13356	. . . . . 6 ⊢ ((𝑋 ∈ 𝑊 ∧ (𝑎 ∈ (0...(#‘𝑋)) ∧ 𝑏 ∈ (𝐼 × 2𝑜))) → (#‘(𝑋 splice ⟨𝑎, 𝑎, ⟨“𝑏(𝑀‘𝑏)”⟩⟩)) = ((#‘𝑋) + ((#‘⟨“𝑏(𝑀‘𝑏)”⟩) − (𝑎 − 𝑎))))
28		s2len 13484	. . . . . . . . . 10 ⊢ (#‘⟨“𝑏(𝑀‘𝑏)”⟩) = 2
29	28	a1i 11	. . . . . . . . 9 ⊢ ((𝑋 ∈ 𝑊 ∧ (𝑎 ∈ (0...(#‘𝑋)) ∧ 𝑏 ∈ (𝐼 × 2𝑜))) → (#‘⟨“𝑏(𝑀‘𝑏)”⟩) = 2)
30		eluzelcn 11575	. . . . . . . . . . 11 ⊢ (𝑎 ∈ (ℤ≥‘0) → 𝑎 ∈ ℂ)
31	18, 30	syl 17	. . . . . . . . . 10 ⊢ ((𝑋 ∈ 𝑊 ∧ (𝑎 ∈ (0...(#‘𝑋)) ∧ 𝑏 ∈ (𝐼 × 2𝑜))) → 𝑎 ∈ ℂ)
32	31	subidd 10259	. . . . . . . . 9 ⊢ ((𝑋 ∈ 𝑊 ∧ (𝑎 ∈ (0...(#‘𝑋)) ∧ 𝑏 ∈ (𝐼 × 2𝑜))) → (𝑎 − 𝑎) = 0)
33	29, 32	oveq12d 6567	. . . . . . . 8 ⊢ ((𝑋 ∈ 𝑊 ∧ (𝑎 ∈ (0...(#‘𝑋)) ∧ 𝑏 ∈ (𝐼 × 2𝑜))) → ((#‘⟨“𝑏(𝑀‘𝑏)”⟩) − (𝑎 − 𝑎)) = (2 − 0))
34		2cn 10968	. . . . . . . . 9 ⊢ 2 ∈ ℂ
35	34	subid1i 10232	. . . . . . . 8 ⊢ (2 − 0) = 2
36	33, 35	syl6eq 2660	. . . . . . 7 ⊢ ((𝑋 ∈ 𝑊 ∧ (𝑎 ∈ (0...(#‘𝑋)) ∧ 𝑏 ∈ (𝐼 × 2𝑜))) → ((#‘⟨“𝑏(𝑀‘𝑏)”⟩) − (𝑎 − 𝑎)) = 2)
37	36	oveq2d 6565	. . . . . 6 ⊢ ((𝑋 ∈ 𝑊 ∧ (𝑎 ∈ (0...(#‘𝑋)) ∧ 𝑏 ∈ (𝐼 × 2𝑜))) → ((#‘𝑋) + ((#‘⟨“𝑏(𝑀‘𝑏)”⟩) − (𝑎 − 𝑎))) = ((#‘𝑋) + 2))
38	27, 37	eqtrd 2644	. . . . 5 ⊢ ((𝑋 ∈ 𝑊 ∧ (𝑎 ∈ (0...(#‘𝑋)) ∧ 𝑏 ∈ (𝐼 × 2𝑜))) → (#‘(𝑋 splice ⟨𝑎, 𝑎, ⟨“𝑏(𝑀‘𝑏)”⟩⟩)) = ((#‘𝑋) + 2))
39		fveq2 6103	. . . . . 6 ⊢ (𝐴 = (𝑋 splice ⟨𝑎, 𝑎, ⟨“𝑏(𝑀‘𝑏)”⟩⟩) → (#‘𝐴) = (#‘(𝑋 splice ⟨𝑎, 𝑎, ⟨“𝑏(𝑀‘𝑏)”⟩⟩)))
40	39	eqeq1d 2612	. . . . 5 ⊢ (𝐴 = (𝑋 splice ⟨𝑎, 𝑎, ⟨“𝑏(𝑀‘𝑏)”⟩⟩) → ((#‘𝐴) = ((#‘𝑋) + 2) ↔ (#‘(𝑋 splice ⟨𝑎, 𝑎, ⟨“𝑏(𝑀‘𝑏)”⟩⟩)) = ((#‘𝑋) + 2)))
41	38, 40	syl5ibrcom 236	. . . 4 ⊢ ((𝑋 ∈ 𝑊 ∧ (𝑎 ∈ (0...(#‘𝑋)) ∧ 𝑏 ∈ (𝐼 × 2𝑜))) → (𝐴 = (𝑋 splice ⟨𝑎, 𝑎, ⟨“𝑏(𝑀‘𝑏)”⟩⟩) → (#‘𝐴) = ((#‘𝑋) + 2)))
42	41	rexlimdvva 3020	. . 3 ⊢ (𝑋 ∈ 𝑊 → (∃𝑎 ∈ (0...(#‘𝑋))∃𝑏 ∈ (𝐼 × 2𝑜)𝐴 = (𝑋 splice ⟨𝑎, 𝑎, ⟨“𝑏(𝑀‘𝑏)”⟩⟩) → (#‘𝐴) = ((#‘𝑋) + 2)))
43	12, 42	sylbid 229	. 2 ⊢ (𝑋 ∈ 𝑊 → (𝐴 ∈ ran (𝑇‘𝑋) → (#‘𝐴) = ((#‘𝑋) + 2)))
44	43	imp 444	1 ⊢ ((𝑋 ∈ 𝑊 ∧ 𝐴 ∈ ran (𝑇‘𝑋)) → (#‘𝐴) = ((#‘𝑋) + 2))

Syntax hints:   → wi 4   ∧ wa 383   = wceq 1475   ∈ wcel 1977  ∃wrex 2897   ∖ cdif 3537  ⟨cop 4131  ⟨cotp 4133   ↦ cmpt 4643   I cid 4948   × cxp 5036  ran crn 5039  ⟶wf 5800  ‘cfv 5804  (class class class)co 6549   ↦ cmpt2 6551  1_𝑜c1o 7440  2_𝑜c2o 7441  ℂcc 9813  0cc0 9815   + caddc 9818   − cmin 10145  2c2 10947  ℤ_≥cuz 11563  ...cfz 12197  #chash 12979  Word cword 13146   splice csplice 13151  ⟨“cs2 13437   ~_FG cefg 17942

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1713  ax-4 1728  ax-5 1827  ax-6 1875  ax-7 1922  ax-8 1979  ax-9 1986  ax-10 2006  ax-11 2021  ax-12 2034  ax-13 2234  ax-ext 2590  ax-rep 4699  ax-sep 4709  ax-nul 4717  ax-pow 4769  ax-pr 4833  ax-un 6847  ax-cnex 9871  ax-resscn 9872  ax-1cn 9873  ax-icn 9874  ax-addcl 9875  ax-addrcl 9876  ax-mulcl 9877  ax-mulrcl 9878  ax-mulcom 9879  ax-addass 9880  ax-mulass 9881  ax-distr 9882  ax-i2m1 9883  ax-1ne0 9884  ax-1rid 9885  ax-rnegex 9886  ax-rrecex 9887  ax-cnre 9888  ax-pre-lttri 9889  ax-pre-lttrn 9890  ax-pre-ltadd 9891  ax-pre-mulgt0 9892

This theorem depends on definitions:  df-bi 196  df-or 384  df-an 385  df-3or 1032  df-3an 1033  df-tru 1478  df-ex 1696  df-nf 1701  df-sb 1868  df-eu 2462  df-mo 2463  df-clab 2597  df-cleq 2603  df-clel 2606  df-nfc 2740  df-ne 2782  df-nel 2783  df-ral 2901  df-rex 2902  df-reu 2903  df-rab 2905  df-v 3175  df-sbc 3403  df-csb 3500  df-dif 3543  df-un 3545  df-in 3547  df-ss 3554  df-pss 3556  df-nul 3875  df-if 4037  df-pw 4110  df-sn 4126  df-pr 4128  df-tp 4130  df-op 4132  df-ot 4134  df-uni 4373  df-int 4411  df-iun 4457  df-br 4584  df-opab 4644  df-mpt 4645  df-tr 4681  df-eprel 4949  df-id 4953  df-po 4959  df-so 4960  df-fr 4997  df-we 4999  df-xp 5044  df-rel 5045  df-cnv 5046  df-co 5047  df-dm 5048  df-rn 5049  df-res 5050  df-ima 5051  df-pred 5597  df-ord 5643  df-on 5644  df-lim 5645  df-suc 5646  df-iota 5768  df-fun 5806  df-fn 5807  df-f 5808  df-f1 5809  df-fo 5810  df-f1o 5811  df-fv 5812  df-riota 6511  df-ov 6552  df-oprab 6553  df-mpt2 6554  df-om 6958  df-1st 7059  df-2nd 7060  df-wrecs 7294  df-recs 7355  df-rdg 7393  df-1o 7447  df-2o 7448  df-oadd 7451  df-er 7629  df-map 7746  df-pm 7747  df-en 7842  df-dom 7843  df-sdom 7844  df-fin 7845  df-card 8648  df-pnf 9955  df-mnf 9956  df-xr 9957  df-ltxr 9958  df-le 9959  df-sub 10147  df-neg 10148  df-nn 10898  df-2 10956  df-n0 11170  df-z 11255  df-uz 11564  df-fz 12198  df-fzo 12335  df-hash 12980  df-word 13154  df-concat 13156  df-s1 13157  df-substr 13158  df-splice 13159  df-s2 13444

This theorem is referenced by:  efgsfo  17975  efgredlemg  17978  efgredlemd  17980  efgredlem  17983  frgpnabllem1  18099