Theorem rhmunitinv 14025

Description: Ring homomorphisms preserve the inverse of unit elements. (Contributed by Thierry Arnoux, 23-Oct-2017.)

Assertion

Ref	Expression
rhmunitinv	⊢ ((𝐹 ∈ (𝑅 RingHom 𝑆) ∧ 𝐴 ∈ (Unit‘𝑅)) → (𝐹‘((invr‘𝑅)‘𝐴)) = ((invr‘𝑆)‘(𝐹‘𝐴)))

Proof of Theorem rhmunitinv

Step	Hyp	Ref	Expression
1		rhmrcl1 14002	. . . . . 6 ⊢ (𝐹 ∈ (𝑅 RingHom 𝑆) → 𝑅 ∈ Ring)
2		eqid 2206	. . . . . . 7 ⊢ (Unit‘𝑅) = (Unit‘𝑅)
3		eqid 2206	. . . . . . 7 ⊢ (invr‘𝑅) = (invr‘𝑅)
4		eqid 2206	. . . . . . 7 ⊢ (.r‘𝑅) = (.r‘𝑅)
5		eqid 2206	. . . . . . 7 ⊢ (1r‘𝑅) = (1r‘𝑅)
6	2, 3, 4, 5	unitlinv 13973	. . . . . 6 ⊢ ((𝑅 ∈ Ring ∧ 𝐴 ∈ (Unit‘𝑅)) → (((invr‘𝑅)‘𝐴)(.r‘𝑅)𝐴) = (1r‘𝑅))
7	1, 6	sylan 283	. . . . 5 ⊢ ((𝐹 ∈ (𝑅 RingHom 𝑆) ∧ 𝐴 ∈ (Unit‘𝑅)) → (((invr‘𝑅)‘𝐴)(.r‘𝑅)𝐴) = (1r‘𝑅))
8	7	fveq2d 5598	. . . 4 ⊢ ((𝐹 ∈ (𝑅 RingHom 𝑆) ∧ 𝐴 ∈ (Unit‘𝑅)) → (𝐹‘(((invr‘𝑅)‘𝐴)(.r‘𝑅)𝐴)) = (𝐹‘(1r‘𝑅)))
9		simpl 109	. . . . 5 ⊢ ((𝐹 ∈ (𝑅 RingHom 𝑆) ∧ 𝐴 ∈ (Unit‘𝑅)) → 𝐹 ∈ (𝑅 RingHom 𝑆))
10		eqidd 2207	. . . . . . 7 ⊢ ((𝐹 ∈ (𝑅 RingHom 𝑆) ∧ 𝐴 ∈ (Unit‘𝑅)) → (Base‘𝑅) = (Base‘𝑅))
11		eqidd 2207	. . . . . . 7 ⊢ ((𝐹 ∈ (𝑅 RingHom 𝑆) ∧ 𝐴 ∈ (Unit‘𝑅)) → (Unit‘𝑅) = (Unit‘𝑅))
12	1	adantr 276	. . . . . . . 8 ⊢ ((𝐹 ∈ (𝑅 RingHom 𝑆) ∧ 𝐴 ∈ (Unit‘𝑅)) → 𝑅 ∈ Ring)
13		ringsrg 13894	. . . . . . . 8 ⊢ (𝑅 ∈ Ring → 𝑅 ∈ SRing)
14	12, 13	syl 14	. . . . . . 7 ⊢ ((𝐹 ∈ (𝑅 RingHom 𝑆) ∧ 𝐴 ∈ (Unit‘𝑅)) → 𝑅 ∈ SRing)
15	10, 11, 14	unitssd 13956	. . . . . 6 ⊢ ((𝐹 ∈ (𝑅 RingHom 𝑆) ∧ 𝐴 ∈ (Unit‘𝑅)) → (Unit‘𝑅) ⊆ (Base‘𝑅))
16	2, 3	unitinvcl 13970	. . . . . . 7 ⊢ ((𝑅 ∈ Ring ∧ 𝐴 ∈ (Unit‘𝑅)) → ((invr‘𝑅)‘𝐴) ∈ (Unit‘𝑅))
17	1, 16	sylan 283	. . . . . 6 ⊢ ((𝐹 ∈ (𝑅 RingHom 𝑆) ∧ 𝐴 ∈ (Unit‘𝑅)) → ((invr‘𝑅)‘𝐴) ∈ (Unit‘𝑅))
18	15, 17	sseldd 3198	. . . . 5 ⊢ ((𝐹 ∈ (𝑅 RingHom 𝑆) ∧ 𝐴 ∈ (Unit‘𝑅)) → ((invr‘𝑅)‘𝐴) ∈ (Base‘𝑅))
19		simpr 110	. . . . . 6 ⊢ ((𝐹 ∈ (𝑅 RingHom 𝑆) ∧ 𝐴 ∈ (Unit‘𝑅)) → 𝐴 ∈ (Unit‘𝑅))
20	15, 19	sseldd 3198	. . . . 5 ⊢ ((𝐹 ∈ (𝑅 RingHom 𝑆) ∧ 𝐴 ∈ (Unit‘𝑅)) → 𝐴 ∈ (Base‘𝑅))
21		eqid 2206	. . . . . 6 ⊢ (Base‘𝑅) = (Base‘𝑅)
22		eqid 2206	. . . . . 6 ⊢ (.r‘𝑆) = (.r‘𝑆)
23	21, 4, 22	rhmmul 14011	. . . . 5 ⊢ ((𝐹 ∈ (𝑅 RingHom 𝑆) ∧ ((invr‘𝑅)‘𝐴) ∈ (Base‘𝑅) ∧ 𝐴 ∈ (Base‘𝑅)) → (𝐹‘(((invr‘𝑅)‘𝐴)(.r‘𝑅)𝐴)) = ((𝐹‘((invr‘𝑅)‘𝐴))(.r‘𝑆)(𝐹‘𝐴)))
24	9, 18, 20, 23	syl3anc 1250	. . . 4 ⊢ ((𝐹 ∈ (𝑅 RingHom 𝑆) ∧ 𝐴 ∈ (Unit‘𝑅)) → (𝐹‘(((invr‘𝑅)‘𝐴)(.r‘𝑅)𝐴)) = ((𝐹‘((invr‘𝑅)‘𝐴))(.r‘𝑆)(𝐹‘𝐴)))
25		eqid 2206	. . . . . 6 ⊢ (1r‘𝑆) = (1r‘𝑆)
26	5, 25	rhm1 14014	. . . . 5 ⊢ (𝐹 ∈ (𝑅 RingHom 𝑆) → (𝐹‘(1r‘𝑅)) = (1r‘𝑆))
27	26	adantr 276	. . . 4 ⊢ ((𝐹 ∈ (𝑅 RingHom 𝑆) ∧ 𝐴 ∈ (Unit‘𝑅)) → (𝐹‘(1r‘𝑅)) = (1r‘𝑆))
28	8, 24, 27	3eqtr3d 2247	. . 3 ⊢ ((𝐹 ∈ (𝑅 RingHom 𝑆) ∧ 𝐴 ∈ (Unit‘𝑅)) → ((𝐹‘((invr‘𝑅)‘𝐴))(.r‘𝑆)(𝐹‘𝐴)) = (1r‘𝑆))
29		rhmrcl2 14003	. . . . 5 ⊢ (𝐹 ∈ (𝑅 RingHom 𝑆) → 𝑆 ∈ Ring)
30	29	adantr 276	. . . 4 ⊢ ((𝐹 ∈ (𝑅 RingHom 𝑆) ∧ 𝐴 ∈ (Unit‘𝑅)) → 𝑆 ∈ Ring)
31		elrhmunit 14024	. . . 4 ⊢ ((𝐹 ∈ (𝑅 RingHom 𝑆) ∧ 𝐴 ∈ (Unit‘𝑅)) → (𝐹‘𝐴) ∈ (Unit‘𝑆))
32		eqid 2206	. . . . 5 ⊢ (Unit‘𝑆) = (Unit‘𝑆)
33		eqid 2206	. . . . 5 ⊢ (invr‘𝑆) = (invr‘𝑆)
34	32, 33, 22, 25	unitlinv 13973	. . . 4 ⊢ ((𝑆 ∈ Ring ∧ (𝐹‘𝐴) ∈ (Unit‘𝑆)) → (((invr‘𝑆)‘(𝐹‘𝐴))(.r‘𝑆)(𝐹‘𝐴)) = (1r‘𝑆))
35	30, 31, 34	syl2anc 411	. . 3 ⊢ ((𝐹 ∈ (𝑅 RingHom 𝑆) ∧ 𝐴 ∈ (Unit‘𝑅)) → (((invr‘𝑆)‘(𝐹‘𝐴))(.r‘𝑆)(𝐹‘𝐴)) = (1r‘𝑆))
36	28, 35	eqtr4d 2242	. 2 ⊢ ((𝐹 ∈ (𝑅 RingHom 𝑆) ∧ 𝐴 ∈ (Unit‘𝑅)) → ((𝐹‘((invr‘𝑅)‘𝐴))(.r‘𝑆)(𝐹‘𝐴)) = (((invr‘𝑆)‘(𝐹‘𝐴))(.r‘𝑆)(𝐹‘𝐴)))
37		eqidd 2207	. . . . . 6 ⊢ ((𝐹 ∈ (𝑅 RingHom 𝑆) ∧ 𝐴 ∈ (Unit‘𝑅)) → ((mulGrp‘𝑆) ↾s (Unit‘𝑆)) = ((mulGrp‘𝑆) ↾s (Unit‘𝑆)))
38		eqid 2206	. . . . . . . 8 ⊢ (mulGrp‘𝑆) = (mulGrp‘𝑆)
39	38, 22	mgpplusgg 13771	. . . . . . 7 ⊢ (𝑆 ∈ Ring → (.r‘𝑆) = (+g‘(mulGrp‘𝑆)))
40	30, 39	syl 14	. . . . . 6 ⊢ ((𝐹 ∈ (𝑅 RingHom 𝑆) ∧ 𝐴 ∈ (Unit‘𝑅)) → (.r‘𝑆) = (+g‘(mulGrp‘𝑆)))
41		basfn 12975	. . . . . . . 8 ⊢ Base Fn V
42	30	elexd 2787	. . . . . . . 8 ⊢ ((𝐹 ∈ (𝑅 RingHom 𝑆) ∧ 𝐴 ∈ (Unit‘𝑅)) → 𝑆 ∈ V)
43		funfvex 5611	. . . . . . . . 9 ⊢ ((Fun Base ∧ 𝑆 ∈ dom Base) → (Base‘𝑆) ∈ V)
44	43	funfni 5390	. . . . . . . 8 ⊢ ((Base Fn V ∧ 𝑆 ∈ V) → (Base‘𝑆) ∈ V)
45	41, 42, 44	sylancr 414	. . . . . . 7 ⊢ ((𝐹 ∈ (𝑅 RingHom 𝑆) ∧ 𝐴 ∈ (Unit‘𝑅)) → (Base‘𝑆) ∈ V)
46		eqidd 2207	. . . . . . . 8 ⊢ ((𝐹 ∈ (𝑅 RingHom 𝑆) ∧ 𝐴 ∈ (Unit‘𝑅)) → (Base‘𝑆) = (Base‘𝑆))
47		eqidd 2207	. . . . . . . 8 ⊢ ((𝐹 ∈ (𝑅 RingHom 𝑆) ∧ 𝐴 ∈ (Unit‘𝑅)) → (Unit‘𝑆) = (Unit‘𝑆))
48		ringsrg 13894	. . . . . . . . 9 ⊢ (𝑆 ∈ Ring → 𝑆 ∈ SRing)
49	30, 48	syl 14	. . . . . . . 8 ⊢ ((𝐹 ∈ (𝑅 RingHom 𝑆) ∧ 𝐴 ∈ (Unit‘𝑅)) → 𝑆 ∈ SRing)
50	46, 47, 49	unitssd 13956	. . . . . . 7 ⊢ ((𝐹 ∈ (𝑅 RingHom 𝑆) ∧ 𝐴 ∈ (Unit‘𝑅)) → (Unit‘𝑆) ⊆ (Base‘𝑆))
51	45, 50	ssexd 4195	. . . . . 6 ⊢ ((𝐹 ∈ (𝑅 RingHom 𝑆) ∧ 𝐴 ∈ (Unit‘𝑅)) → (Unit‘𝑆) ∈ V)
52	38	mgpex 13772	. . . . . . 7 ⊢ (𝑆 ∈ Ring → (mulGrp‘𝑆) ∈ V)
53	30, 52	syl 14	. . . . . 6 ⊢ ((𝐹 ∈ (𝑅 RingHom 𝑆) ∧ 𝐴 ∈ (Unit‘𝑅)) → (mulGrp‘𝑆) ∈ V)
54	37, 40, 51, 53	ressplusgd 13046	. . . . 5 ⊢ ((𝐹 ∈ (𝑅 RingHom 𝑆) ∧ 𝐴 ∈ (Unit‘𝑅)) → (.r‘𝑆) = (+g‘((mulGrp‘𝑆) ↾s (Unit‘𝑆))))
55	54	oveqd 5979	. . . 4 ⊢ ((𝐹 ∈ (𝑅 RingHom 𝑆) ∧ 𝐴 ∈ (Unit‘𝑅)) → ((𝐹‘((invr‘𝑅)‘𝐴))(.r‘𝑆)(𝐹‘𝐴)) = ((𝐹‘((invr‘𝑅)‘𝐴))(+g‘((mulGrp‘𝑆) ↾s (Unit‘𝑆)))(𝐹‘𝐴)))
56	54	oveqd 5979	. . . 4 ⊢ ((𝐹 ∈ (𝑅 RingHom 𝑆) ∧ 𝐴 ∈ (Unit‘𝑅)) → (((invr‘𝑆)‘(𝐹‘𝐴))(.r‘𝑆)(𝐹‘𝐴)) = (((invr‘𝑆)‘(𝐹‘𝐴))(+g‘((mulGrp‘𝑆) ↾s (Unit‘𝑆)))(𝐹‘𝐴)))
57	55, 56	eqeq12d 2221	. . 3 ⊢ ((𝐹 ∈ (𝑅 RingHom 𝑆) ∧ 𝐴 ∈ (Unit‘𝑅)) → (((𝐹‘((invr‘𝑅)‘𝐴))(.r‘𝑆)(𝐹‘𝐴)) = (((invr‘𝑆)‘(𝐹‘𝐴))(.r‘𝑆)(𝐹‘𝐴)) ↔ ((𝐹‘((invr‘𝑅)‘𝐴))(+g‘((mulGrp‘𝑆) ↾s (Unit‘𝑆)))(𝐹‘𝐴)) = (((invr‘𝑆)‘(𝐹‘𝐴))(+g‘((mulGrp‘𝑆) ↾s (Unit‘𝑆)))(𝐹‘𝐴))))
58		eqid 2206	. . . . . . 7 ⊢ ((mulGrp‘𝑆) ↾s (Unit‘𝑆)) = ((mulGrp‘𝑆) ↾s (Unit‘𝑆))
59	32, 58	unitgrp 13963	. . . . . 6 ⊢ (𝑆 ∈ Ring → ((mulGrp‘𝑆) ↾s (Unit‘𝑆)) ∈ Grp)
60	29, 59	syl 14	. . . . 5 ⊢ (𝐹 ∈ (𝑅 RingHom 𝑆) → ((mulGrp‘𝑆) ↾s (Unit‘𝑆)) ∈ Grp)
61	60	adantr 276	. . . 4 ⊢ ((𝐹 ∈ (𝑅 RingHom 𝑆) ∧ 𝐴 ∈ (Unit‘𝑅)) → ((mulGrp‘𝑆) ↾s (Unit‘𝑆)) ∈ Grp)
62		elrhmunit 14024	. . . . . 6 ⊢ ((𝐹 ∈ (𝑅 RingHom 𝑆) ∧ ((invr‘𝑅)‘𝐴) ∈ (Unit‘𝑅)) → (𝐹‘((invr‘𝑅)‘𝐴)) ∈ (Unit‘𝑆))
63	17, 62	syldan 282	. . . . 5 ⊢ ((𝐹 ∈ (𝑅 RingHom 𝑆) ∧ 𝐴 ∈ (Unit‘𝑅)) → (𝐹‘((invr‘𝑅)‘𝐴)) ∈ (Unit‘𝑆))
64	47, 37, 49	unitgrpbasd 13962	. . . . 5 ⊢ ((𝐹 ∈ (𝑅 RingHom 𝑆) ∧ 𝐴 ∈ (Unit‘𝑅)) → (Unit‘𝑆) = (Base‘((mulGrp‘𝑆) ↾s (Unit‘𝑆))))
65	63, 64	eleqtrd 2285	. . . 4 ⊢ ((𝐹 ∈ (𝑅 RingHom 𝑆) ∧ 𝐴 ∈ (Unit‘𝑅)) → (𝐹‘((invr‘𝑅)‘𝐴)) ∈ (Base‘((mulGrp‘𝑆) ↾s (Unit‘𝑆))))
66	32, 33	unitinvcl 13970	. . . . . 6 ⊢ ((𝑆 ∈ Ring ∧ (𝐹‘𝐴) ∈ (Unit‘𝑆)) → ((invr‘𝑆)‘(𝐹‘𝐴)) ∈ (Unit‘𝑆))
67	30, 31, 66	syl2anc 411	. . . . 5 ⊢ ((𝐹 ∈ (𝑅 RingHom 𝑆) ∧ 𝐴 ∈ (Unit‘𝑅)) → ((invr‘𝑆)‘(𝐹‘𝐴)) ∈ (Unit‘𝑆))
68	67, 64	eleqtrd 2285	. . . 4 ⊢ ((𝐹 ∈ (𝑅 RingHom 𝑆) ∧ 𝐴 ∈ (Unit‘𝑅)) → ((invr‘𝑆)‘(𝐹‘𝐴)) ∈ (Base‘((mulGrp‘𝑆) ↾s (Unit‘𝑆))))
69	31, 64	eleqtrd 2285	. . . 4 ⊢ ((𝐹 ∈ (𝑅 RingHom 𝑆) ∧ 𝐴 ∈ (Unit‘𝑅)) → (𝐹‘𝐴) ∈ (Base‘((mulGrp‘𝑆) ↾s (Unit‘𝑆))))
70		eqid 2206	. . . . 5 ⊢ (Base‘((mulGrp‘𝑆) ↾s (Unit‘𝑆))) = (Base‘((mulGrp‘𝑆) ↾s (Unit‘𝑆)))
71		eqid 2206	. . . . 5 ⊢ (+g‘((mulGrp‘𝑆) ↾s (Unit‘𝑆))) = (+g‘((mulGrp‘𝑆) ↾s (Unit‘𝑆)))
72	70, 71	grprcan 13454	. . . 4 ⊢ ((((mulGrp‘𝑆) ↾s (Unit‘𝑆)) ∈ Grp ∧ ((𝐹‘((invr‘𝑅)‘𝐴)) ∈ (Base‘((mulGrp‘𝑆) ↾s (Unit‘𝑆))) ∧ ((invr‘𝑆)‘(𝐹‘𝐴)) ∈ (Base‘((mulGrp‘𝑆) ↾s (Unit‘𝑆))) ∧ (𝐹‘𝐴) ∈ (Base‘((mulGrp‘𝑆) ↾s (Unit‘𝑆))))) → (((𝐹‘((invr‘𝑅)‘𝐴))(+g‘((mulGrp‘𝑆) ↾s (Unit‘𝑆)))(𝐹‘𝐴)) = (((invr‘𝑆)‘(𝐹‘𝐴))(+g‘((mulGrp‘𝑆) ↾s (Unit‘𝑆)))(𝐹‘𝐴)) ↔ (𝐹‘((invr‘𝑅)‘𝐴)) = ((invr‘𝑆)‘(𝐹‘𝐴))))
73	61, 65, 68, 69, 72	syl13anc 1252	. . 3 ⊢ ((𝐹 ∈ (𝑅 RingHom 𝑆) ∧ 𝐴 ∈ (Unit‘𝑅)) → (((𝐹‘((invr‘𝑅)‘𝐴))(+g‘((mulGrp‘𝑆) ↾s (Unit‘𝑆)))(𝐹‘𝐴)) = (((invr‘𝑆)‘(𝐹‘𝐴))(+g‘((mulGrp‘𝑆) ↾s (Unit‘𝑆)))(𝐹‘𝐴)) ↔ (𝐹‘((invr‘𝑅)‘𝐴)) = ((invr‘𝑆)‘(𝐹‘𝐴))))
74	57, 73	bitrd 188	. 2 ⊢ ((𝐹 ∈ (𝑅 RingHom 𝑆) ∧ 𝐴 ∈ (Unit‘𝑅)) → (((𝐹‘((invr‘𝑅)‘𝐴))(.r‘𝑆)(𝐹‘𝐴)) = (((invr‘𝑆)‘(𝐹‘𝐴))(.r‘𝑆)(𝐹‘𝐴)) ↔ (𝐹‘((invr‘𝑅)‘𝐴)) = ((invr‘𝑆)‘(𝐹‘𝐴))))
75	36, 74	mpbid 147	1 ⊢ ((𝐹 ∈ (𝑅 RingHom 𝑆) ∧ 𝐴 ∈ (Unit‘𝑅)) → (𝐹‘((invr‘𝑅)‘𝐴)) = ((invr‘𝑆)‘(𝐹‘𝐴)))

Syntax hints:   → wi 4   ∧ wa 104   ↔ wb 105   = wceq 1373   ∈ wcel 2177  Vcvv 2773   Fn wfn 5280  ‘cfv 5285  (class class class)co 5962  Basecbs 12917   ↾_s cress 12918  +_gcplusg 12994  ._rcmulr 12995  Grpcgrp 13417  mulGrpcmgp 13767  1_rcur 13806  SRingcsrg 13810  Ringcrg 13843  Unitcui 13934  inv_rcinvr 13967   RingHom crh 13997

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-in1 615  ax-in2 616  ax-io 711  ax-5 1471  ax-7 1472  ax-gen 1473  ax-ie1 1517  ax-ie2 1518  ax-8 1528  ax-10 1529  ax-11 1530  ax-i12 1531  ax-bndl 1533  ax-4 1534  ax-17 1550  ax-i9 1554  ax-ial 1558  ax-i5r 1559  ax-13 2179  ax-14 2180  ax-ext 2188  ax-coll 4170  ax-sep 4173  ax-nul 4181  ax-pow 4229  ax-pr 4264  ax-un 4493  ax-setind 4598  ax-cnex 8046  ax-resscn 8047  ax-1cn 8048  ax-1re 8049  ax-icn 8050  ax-addcl 8051  ax-addrcl 8052  ax-mulcl 8053  ax-addcom 8055  ax-addass 8057  ax-i2m1 8060  ax-0lt1 8061  ax-0id 8063  ax-rnegex 8064  ax-pre-ltirr 8067  ax-pre-lttrn 8069  ax-pre-ltadd 8071

This theorem depends on definitions:  df-bi 117  df-3an 983  df-tru 1376  df-fal 1379  df-nf 1485  df-sb 1787  df-eu 2058  df-mo 2059  df-clab 2193  df-cleq 2199  df-clel 2202  df-nfc 2338  df-ne 2378  df-nel 2473  df-ral 2490  df-rex 2491  df-reu 2492  df-rmo 2493  df-rab 2494  df-v 2775  df-sbc 3003  df-csb 3098  df-dif 3172  df-un 3174  df-in 3176  df-ss 3183  df-nul 3465  df-pw 3623  df-sn 3644  df-pr 3645  df-op 3647  df-uni 3860  df-int 3895  df-iun 3938  df-br 4055  df-opab 4117  df-mpt 4118  df-id 4353  df-xp 4694  df-rel 4695  df-cnv 4696  df-co 4697  df-dm 4698  df-rn 4699  df-res 4700  df-ima 4701  df-iota 5246  df-fun 5287  df-fn 5288  df-f 5289  df-f1 5290  df-fo 5291  df-f1o 5292  df-fv 5293  df-riota 5917  df-ov 5965  df-oprab 5966  df-mpo 5967  df-1st 6244  df-2nd 6245  df-tpos 6349  df-map 6755  df-pnf 8139  df-mnf 8140  df-ltxr 8142  df-inn 9067  df-2 9125  df-3 9126  df-ndx 12920  df-slot 12921  df-base 12923  df-sets 12924  df-iress 12925  df-plusg 13007  df-mulr 13008  df-0g 13175  df-mgm 13273  df-sgrp 13319  df-mnd 13334  df-mhm 13376  df-grp 13420  df-minusg 13421  df-ghm 13662  df-cmn 13707  df-abl 13708  df-mgp 13768  df-ur 13807  df-srg 13811  df-ring 13845  df-oppr 13915  df-dvdsr 13936  df-unit 13937  df-invr 13968  df-rhm 13999

This theorem is referenced by: (None)