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Theorem frgpcpbl 19621

Description: Compatibility of the group operation with the free group equivalence relation. (Contributed by Mario Carneiro, 1-Oct-2015.) (Revised by Mario Carneiro, 27-Feb-2016.)

**Hypotheses**
Ref	Expression
frgpval.m	⊢ 𝐺 = (freeGrp‘𝐼)
frgpval.b	⊢ 𝑀 = (freeMnd‘(𝐼 × 2_o))
frgpval.r	⊢ ∼ = ( ~_FG ‘𝐼)
frgpcpbl.p	⊢ + = (+_g‘𝑀)

**Assertion**
Ref	Expression
frgpcpbl	⊢ ((𝐴 ∼ 𝐶 ∧ 𝐵 ∼ 𝐷) → (𝐴 + 𝐵) ∼ (𝐶 + 𝐷))

Proof of Theorem frgpcpbl Dummy variables 𝑘 𝑚 𝑛 𝑡 𝑣 𝑤 𝑥 𝑦 𝑧 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		eqid 2732	. . 3 ⊢ ( I ‘Word (𝐼 × 2_o)) = ( I ‘Word (𝐼 × 2_o))
2		frgpval.r	. . 3 ⊢ ∼ = ( ~_FG ‘𝐼)
3		eqid 2732	. . 3 ⊢ (𝑦 ∈ 𝐼, 𝑧 ∈ 2_o ↦ ⟨𝑦, (1_o ∖ 𝑧)⟩) = (𝑦 ∈ 𝐼, 𝑧 ∈ 2_o ↦ ⟨𝑦, (1_o ∖ 𝑧)⟩)
4		eqid 2732	. . 3 ⊢ (𝑣 ∈ ( I ‘Word (𝐼 × 2_o)) ↦ (𝑛 ∈ (0...(♯‘𝑣)), 𝑤 ∈ (𝐼 × 2_o) ↦ (𝑣 splice ⟨𝑛, 𝑛, ⟨“𝑤((𝑦 ∈ 𝐼, 𝑧 ∈ 2_o ↦ ⟨𝑦, (1_o ∖ 𝑧)⟩)‘𝑤)”⟩⟩))) = (𝑣 ∈ ( I ‘Word (𝐼 × 2_o)) ↦ (𝑛 ∈ (0...(♯‘𝑣)), 𝑤 ∈ (𝐼 × 2_o) ↦ (𝑣 splice ⟨𝑛, 𝑛, ⟨“𝑤((𝑦 ∈ 𝐼, 𝑧 ∈ 2_o ↦ ⟨𝑦, (1_o ∖ 𝑧)⟩)‘𝑤)”⟩⟩)))
5		eqid 2732	. . 3 ⊢ (( I ‘Word (𝐼 × 2_o)) ∖ ∪ 𝑥 ∈ ( I ‘Word (𝐼 × 2_o))ran ((𝑣 ∈ ( I ‘Word (𝐼 × 2_o)) ↦ (𝑛 ∈ (0...(♯‘𝑣)), 𝑤 ∈ (𝐼 × 2_o) ↦ (𝑣 splice ⟨𝑛, 𝑛, ⟨“𝑤((𝑦 ∈ 𝐼, 𝑧 ∈ 2_o ↦ ⟨𝑦, (1_o ∖ 𝑧)⟩)‘𝑤)”⟩⟩)))‘𝑥)) = (( I ‘Word (𝐼 × 2_o)) ∖ ∪ 𝑥 ∈ ( I ‘Word (𝐼 × 2_o))ran ((𝑣 ∈ ( I ‘Word (𝐼 × 2_o)) ↦ (𝑛 ∈ (0...(♯‘𝑣)), 𝑤 ∈ (𝐼 × 2_o) ↦ (𝑣 splice ⟨𝑛, 𝑛, ⟨“𝑤((𝑦 ∈ 𝐼, 𝑧 ∈ 2_o ↦ ⟨𝑦, (1_o ∖ 𝑧)⟩)‘𝑤)”⟩⟩)))‘𝑥))
6		eqid 2732	. . 3 ⊢ (𝑚 ∈ {𝑡 ∈ (Word ( I ‘Word (𝐼 × 2_o)) ∖ {∅}) ∣ ((𝑡‘0) ∈ (( I ‘Word (𝐼 × 2_o)) ∖ ∪ 𝑥 ∈ ( I ‘Word (𝐼 × 2_o))ran ((𝑣 ∈ ( I ‘Word (𝐼 × 2_o)) ↦ (𝑛 ∈ (0...(♯‘𝑣)), 𝑤 ∈ (𝐼 × 2_o) ↦ (𝑣 splice ⟨𝑛, 𝑛, ⟨“𝑤((𝑦 ∈ 𝐼, 𝑧 ∈ 2_o ↦ ⟨𝑦, (1_o ∖ 𝑧)⟩)‘𝑤)”⟩⟩)))‘𝑥)) ∧ ∀𝑘 ∈ (1..^(♯‘𝑡))(𝑡‘𝑘) ∈ ran ((𝑣 ∈ ( I ‘Word (𝐼 × 2_o)) ↦ (𝑛 ∈ (0...(♯‘𝑣)), 𝑤 ∈ (𝐼 × 2_o) ↦ (𝑣 splice ⟨𝑛, 𝑛, ⟨“𝑤((𝑦 ∈ 𝐼, 𝑧 ∈ 2_o ↦ ⟨𝑦, (1_o ∖ 𝑧)⟩)‘𝑤)”⟩⟩)))‘(𝑡‘(𝑘 − 1))))} ↦ (𝑚‘((♯‘𝑚) − 1))) = (𝑚 ∈ {𝑡 ∈ (Word ( I ‘Word (𝐼 × 2_o)) ∖ {∅}) ∣ ((𝑡‘0) ∈ (( I ‘Word (𝐼 × 2_o)) ∖ ∪ 𝑥 ∈ ( I ‘Word (𝐼 × 2_o))ran ((𝑣 ∈ ( I ‘Word (𝐼 × 2_o)) ↦ (𝑛 ∈ (0...(♯‘𝑣)), 𝑤 ∈ (𝐼 × 2_o) ↦ (𝑣 splice ⟨𝑛, 𝑛, ⟨“𝑤((𝑦 ∈ 𝐼, 𝑧 ∈ 2_o ↦ ⟨𝑦, (1_o ∖ 𝑧)⟩)‘𝑤)”⟩⟩)))‘𝑥)) ∧ ∀𝑘 ∈ (1..^(♯‘𝑡))(𝑡‘𝑘) ∈ ran ((𝑣 ∈ ( I ‘Word (𝐼 × 2_o)) ↦ (𝑛 ∈ (0...(♯‘𝑣)), 𝑤 ∈ (𝐼 × 2_o) ↦ (𝑣 splice ⟨𝑛, 𝑛, ⟨“𝑤((𝑦 ∈ 𝐼, 𝑧 ∈ 2_o ↦ ⟨𝑦, (1_o ∖ 𝑧)⟩)‘𝑤)”⟩⟩)))‘(𝑡‘(𝑘 − 1))))} ↦ (𝑚‘((♯‘𝑚) − 1)))
7	1, 2, 3, 4, 5, 6	efgcpbl2 19619	. 2 ⊢ ((𝐴 ∼ 𝐶 ∧ 𝐵 ∼ 𝐷) → (𝐴 ++ 𝐵) ∼ (𝐶 ++ 𝐷))
8	1, 2	efger 19580	. . . . . 6 ⊢ ∼ Er ( I ‘Word (𝐼 × 2_o))
9	8	a1i 11	. . . . 5 ⊢ ((𝐴 ∼ 𝐶 ∧ 𝐵 ∼ 𝐷) → ∼ Er ( I ‘Word (𝐼 × 2_o)))
10		simpl 483	. . . . 5 ⊢ ((𝐴 ∼ 𝐶 ∧ 𝐵 ∼ 𝐷) → 𝐴 ∼ 𝐶)
11	9, 10	ercl 8710	. . . 4 ⊢ ((𝐴 ∼ 𝐶 ∧ 𝐵 ∼ 𝐷) → 𝐴 ∈ ( I ‘Word (𝐼 × 2_o)))
12	1	efgrcl 19577	. . . . . . 7 ⊢ (𝐴 ∈ ( I ‘Word (𝐼 × 2_o)) → (𝐼 ∈ V ∧ ( I ‘Word (𝐼 × 2_o)) = Word (𝐼 × 2_o)))
13	11, 12	syl 17	. . . . . 6 ⊢ ((𝐴 ∼ 𝐶 ∧ 𝐵 ∼ 𝐷) → (𝐼 ∈ V ∧ ( I ‘Word (𝐼 × 2_o)) = Word (𝐼 × 2_o)))
14	13	simprd 496	. . . . 5 ⊢ ((𝐴 ∼ 𝐶 ∧ 𝐵 ∼ 𝐷) → ( I ‘Word (𝐼 × 2_o)) = Word (𝐼 × 2_o))
15	13	simpld 495	. . . . . . 7 ⊢ ((𝐴 ∼ 𝐶 ∧ 𝐵 ∼ 𝐷) → 𝐼 ∈ V)
16		2on 8476	. . . . . . 7 ⊢ 2_o ∈ On
17		xpexg 7733	. . . . . . 7 ⊢ ((𝐼 ∈ V ∧ 2_o ∈ On) → (𝐼 × 2_o) ∈ V)
18	15, 16, 17	sylancl 586	. . . . . 6 ⊢ ((𝐴 ∼ 𝐶 ∧ 𝐵 ∼ 𝐷) → (𝐼 × 2_o) ∈ V)
19		frgpval.b	. . . . . . 7 ⊢ 𝑀 = (freeMnd‘(𝐼 × 2_o))
20		eqid 2732	. . . . . . 7 ⊢ (Base‘𝑀) = (Base‘𝑀)
21	19, 20	frmdbas 18729	. . . . . 6 ⊢ ((𝐼 × 2_o) ∈ V → (Base‘𝑀) = Word (𝐼 × 2_o))
22	18, 21	syl 17	. . . . 5 ⊢ ((𝐴 ∼ 𝐶 ∧ 𝐵 ∼ 𝐷) → (Base‘𝑀) = Word (𝐼 × 2_o))
23	14, 22	eqtr4d 2775	. . . 4 ⊢ ((𝐴 ∼ 𝐶 ∧ 𝐵 ∼ 𝐷) → ( I ‘Word (𝐼 × 2_o)) = (Base‘𝑀))
24	11, 23	eleqtrd 2835	. . 3 ⊢ ((𝐴 ∼ 𝐶 ∧ 𝐵 ∼ 𝐷) → 𝐴 ∈ (Base‘𝑀))
25		simpr 485	. . . . 5 ⊢ ((𝐴 ∼ 𝐶 ∧ 𝐵 ∼ 𝐷) → 𝐵 ∼ 𝐷)
26	9, 25	ercl 8710	. . . 4 ⊢ ((𝐴 ∼ 𝐶 ∧ 𝐵 ∼ 𝐷) → 𝐵 ∈ ( I ‘Word (𝐼 × 2_o)))
27	26, 23	eleqtrd 2835	. . 3 ⊢ ((𝐴 ∼ 𝐶 ∧ 𝐵 ∼ 𝐷) → 𝐵 ∈ (Base‘𝑀))
28		frgpcpbl.p	. . . 4 ⊢ + = (+_g‘𝑀)
29	19, 20, 28	frmdadd 18732	. . 3 ⊢ ((𝐴 ∈ (Base‘𝑀) ∧ 𝐵 ∈ (Base‘𝑀)) → (𝐴 + 𝐵) = (𝐴 ++ 𝐵))
30	24, 27, 29	syl2anc 584	. 2 ⊢ ((𝐴 ∼ 𝐶 ∧ 𝐵 ∼ 𝐷) → (𝐴 + 𝐵) = (𝐴 ++ 𝐵))
31	9, 10	ercl2 8712	. . . 4 ⊢ ((𝐴 ∼ 𝐶 ∧ 𝐵 ∼ 𝐷) → 𝐶 ∈ ( I ‘Word (𝐼 × 2_o)))
32	31, 23	eleqtrd 2835	. . 3 ⊢ ((𝐴 ∼ 𝐶 ∧ 𝐵 ∼ 𝐷) → 𝐶 ∈ (Base‘𝑀))
33	9, 25	ercl2 8712	. . . 4 ⊢ ((𝐴 ∼ 𝐶 ∧ 𝐵 ∼ 𝐷) → 𝐷 ∈ ( I ‘Word (𝐼 × 2_o)))
34	33, 23	eleqtrd 2835	. . 3 ⊢ ((𝐴 ∼ 𝐶 ∧ 𝐵 ∼ 𝐷) → 𝐷 ∈ (Base‘𝑀))
35	19, 20, 28	frmdadd 18732	. . 3 ⊢ ((𝐶 ∈ (Base‘𝑀) ∧ 𝐷 ∈ (Base‘𝑀)) → (𝐶 + 𝐷) = (𝐶 ++ 𝐷))
36	32, 34, 35	syl2anc 584	. 2 ⊢ ((𝐴 ∼ 𝐶 ∧ 𝐵 ∼ 𝐷) → (𝐶 + 𝐷) = (𝐶 ++ 𝐷))
37	7, 30, 36	3brtr4d 5179	1 ⊢ ((𝐴 ∼ 𝐶 ∧ 𝐵 ∼ 𝐷) → (𝐴 + 𝐵) ∼ (𝐶 + 𝐷))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ∧ wa 396 = wceq 1541 ∈ wcel 2106 ∀wral 3061 {crab 3432 Vcvv 3474 ∖ cdif 3944 ∅c0 4321 {csn 4627 ⟨cop 4633 ⟨cotp 4635 ∪ ciun 4996 class class class wbr 5147 ↦ cmpt 5230 I cid 5572 × cxp 5673 ran crn 5676 Oncon0 6361 ‘cfv 6540 (class class class)co 7405 ∈ cmpo 7407 1_oc1o 8455 2_oc2o 8456 Er wer 8696 0cc0 11106 1c1 11107 − cmin 11440 ...cfz 13480 ..^cfzo 13623 ♯chash 14286 Word cword 14460 ++ cconcat 14516 splice csplice 14695 ⟨“cs2 14788 Basecbs 17140 +_gcplusg 17193 freeMndcfrmd 18724 ~_FG cefg 19568 freeGrpcfrgp 19569

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1913 ax-6 1971 ax-7 2011 ax-8 2108 ax-9 2116 ax-10 2137 ax-11 2154 ax-12 2171 ax-ext 2703 ax-rep 5284 ax-sep 5298 ax-nul 5305 ax-pow 5362 ax-pr 5426 ax-un 7721 ax-cnex 11162 ax-resscn 11163 ax-1cn 11164 ax-icn 11165 ax-addcl 11166 ax-addrcl 11167 ax-mulcl 11168 ax-mulrcl 11169 ax-mulcom 11170 ax-addass 11171 ax-mulass 11172 ax-distr 11173 ax-i2m1 11174 ax-1ne0 11175 ax-1rid 11176 ax-rnegex 11177 ax-rrecex 11178 ax-cnre 11179 ax-pre-lttri 11180 ax-pre-lttrn 11181 ax-pre-ltadd 11182 ax-pre-mulgt0 11183

This theorem depends on definitions: df-bi 206 df-an 397 df-or 846 df-3or 1088 df-3an 1089 df-tru 1544 df-fal 1554 df-ex 1782 df-nf 1786 df-sb 2068 df-mo 2534 df-eu 2563 df-clab 2710 df-cleq 2724 df-clel 2810 df-nfc 2885 df-ne 2941 df-nel 3047 df-ral 3062 df-rex 3071 df-reu 3377 df-rab 3433 df-v 3476 df-sbc 3777 df-csb 3893 df-dif 3950 df-un 3952 df-in 3954 df-ss 3964 df-pss 3966 df-nul 4322 df-if 4528 df-pw 4603 df-sn 4628 df-pr 4630 df-op 4634 df-ot 4636 df-uni 4908 df-int 4950 df-iun 4998 df-iin 4999 df-br 5148 df-opab 5210 df-mpt 5231 df-tr 5265 df-id 5573 df-eprel 5579 df-po 5587 df-so 5588 df-fr 5630 df-we 5632 df-xp 5681 df-rel 5682 df-cnv 5683 df-co 5684 df-dm 5685 df-rn 5686 df-res 5687 df-ima 5688 df-pred 6297 df-ord 6364 df-on 6365 df-lim 6366 df-suc 6367 df-iota 6492 df-fun 6542 df-fn 6543 df-f 6544 df-f1 6545 df-fo 6546 df-f1o 6547 df-fv 6548 df-riota 7361 df-ov 7408 df-oprab 7409 df-mpo 7410 df-om 7852 df-1st 7971 df-2nd 7972 df-frecs 8262 df-wrecs 8293 df-recs 8367 df-rdg 8406 df-1o 8462 df-2o 8463 df-er 8699 df-ec 8701 df-map 8818 df-en 8936 df-dom 8937 df-sdom 8938 df-fin 8939 df-card 9930 df-pnf 11246 df-mnf 11247 df-xr 11248 df-ltxr 11249 df-le 11250 df-sub 11442 df-neg 11443 df-nn 12209 df-2 12271 df-n0 12469 df-z 12555 df-uz 12819 df-fz 13481 df-fzo 13624 df-hash 14287 df-word 14461 df-concat 14517 df-s1 14542 df-substr 14587 df-pfx 14617 df-splice 14696 df-s2 14795 df-struct 17076 df-slot 17111 df-ndx 17123 df-base 17141 df-plusg 17206 df-frmd 18726 df-efg 19571

This theorem is referenced by: frgp0 19622 frgpadd 19625

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