Theorem rhmunitinv 14485

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 14462	. . . . . 6 ⊢ (𝐹 ∈ (𝑅 RingHom 𝑆) → 𝑅 ∈ Ring)
2		eqid 2238	. . . . . . 7 ⊢ (Unit‘𝑅) = (Unit‘𝑅)
3		eqid 2238	. . . . . . 7 ⊢ (invr‘𝑅) = (invr‘𝑅)
4		eqid 2238	. . . . . . 7 ⊢ (.r‘𝑅) = (.r‘𝑅)
5		eqid 2238	. . . . . . 7 ⊢ (1r‘𝑅) = (1r‘𝑅)
6	2, 3, 4, 5	unitlinv 14433	. . . . . 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 5699	. . . 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 2239	. . . . . . 7 ⊢ ((𝐹 ∈ (𝑅 RingHom 𝑆) ∧ 𝐴 ∈ (Unit‘𝑅)) → (Base‘𝑅) = (Base‘𝑅))
11		eqidd 2239	. . . . . . 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 14352	. . . . . . . 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 14416	. . . . . 6 ⊢ ((𝐹 ∈ (𝑅 RingHom 𝑆) ∧ 𝐴 ∈ (Unit‘𝑅)) → (Unit‘𝑅) ⊆ (Base‘𝑅))
16	2, 3	unitinvcl 14430	. . . . . . 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 3249	. . . . 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 3249	. . . . 5 ⊢ ((𝐹 ∈ (𝑅 RingHom 𝑆) ∧ 𝐴 ∈ (Unit‘𝑅)) → 𝐴 ∈ (Base‘𝑅))
21		eqid 2238	. . . . . 6 ⊢ (Base‘𝑅) = (Base‘𝑅)
22		eqid 2238	. . . . . 6 ⊢ (.r‘𝑆) = (.r‘𝑆)
23	21, 4, 22	rhmmul 14471	. . . . 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 1278	. . . 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 2238	. . . . . 6 ⊢ (1r‘𝑆) = (1r‘𝑆)
26	5, 25	rhm1 14474	. . . . 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 2279	. . 3 ⊢ ((𝐹 ∈ (𝑅 RingHom 𝑆) ∧ 𝐴 ∈ (Unit‘𝑅)) → ((𝐹‘((invr‘𝑅)‘𝐴))(.r‘𝑆)(𝐹‘𝐴)) = (1r‘𝑆))
29		rhmrcl2 14463	. . . . 5 ⊢ (𝐹 ∈ (𝑅 RingHom 𝑆) → 𝑆 ∈ Ring)
30	29	adantr 276	. . . 4 ⊢ ((𝐹 ∈ (𝑅 RingHom 𝑆) ∧ 𝐴 ∈ (Unit‘𝑅)) → 𝑆 ∈ Ring)
31		elrhmunit 14484	. . . 4 ⊢ ((𝐹 ∈ (𝑅 RingHom 𝑆) ∧ 𝐴 ∈ (Unit‘𝑅)) → (𝐹‘𝐴) ∈ (Unit‘𝑆))
32		eqid 2238	. . . . 5 ⊢ (Unit‘𝑆) = (Unit‘𝑆)
33		eqid 2238	. . . . 5 ⊢ (invr‘𝑆) = (invr‘𝑆)
34	32, 33, 22, 25	unitlinv 14433	. . . 4 ⊢ ((𝑆 ∈ Ring ∧ (𝐹‘𝐴) ∈ (Unit‘𝑆)) → (((invr‘𝑆)‘(𝐹‘𝐴))(.r‘𝑆)(𝐹‘𝐴)) = (1r‘𝑆))
35	30, 31, 34	syl2anc 415	. . 3 ⊢ ((𝐹 ∈ (𝑅 RingHom 𝑆) ∧ 𝐴 ∈ (Unit‘𝑅)) → (((invr‘𝑆)‘(𝐹‘𝐴))(.r‘𝑆)(𝐹‘𝐴)) = (1r‘𝑆))
36	28, 35	eqtr4d 2274	. 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 2239	. . . . . 6 ⊢ ((𝐹 ∈ (𝑅 RingHom 𝑆) ∧ 𝐴 ∈ (Unit‘𝑅)) → ((mulGrp‘𝑆) ↾s (Unit‘𝑆)) = ((mulGrp‘𝑆) ↾s (Unit‘𝑆)))
38		eqid 2238	. . . . . . . 8 ⊢ (mulGrp‘𝑆) = (mulGrp‘𝑆)
39	38, 22	mgpplusgg 14221	. . . . . . 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 13411	. . . . . . . 8 ⊢ Base Fn V
42	30	elexd 2835	. . . . . . . 8 ⊢ ((𝐹 ∈ (𝑅 RingHom 𝑆) ∧ 𝐴 ∈ (Unit‘𝑅)) → 𝑆 ∈ V)
43		funfvex 5712	. . . . . . . . 9 ⊢ ((Fun Base ∧ 𝑆 ∈ dom Base) → (Base‘𝑆) ∈ V)
44	43	funfni 5483	. . . . . . . 8 ⊢ ((Base Fn V ∧ 𝑆 ∈ V) → (Base‘𝑆) ∈ V)
45	41, 42, 44	sylancr 418	. . . . . . 7 ⊢ ((𝐹 ∈ (𝑅 RingHom 𝑆) ∧ 𝐴 ∈ (Unit‘𝑅)) → (Base‘𝑆) ∈ V)
46		eqidd 2239	. . . . . . . 8 ⊢ ((𝐹 ∈ (𝑅 RingHom 𝑆) ∧ 𝐴 ∈ (Unit‘𝑅)) → (Base‘𝑆) = (Base‘𝑆))
47		eqidd 2239	. . . . . . . 8 ⊢ ((𝐹 ∈ (𝑅 RingHom 𝑆) ∧ 𝐴 ∈ (Unit‘𝑅)) → (Unit‘𝑆) = (Unit‘𝑆))
48		ringsrg 14352	. . . . . . . . 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 14416	. . . . . . 7 ⊢ ((𝐹 ∈ (𝑅 RingHom 𝑆) ∧ 𝐴 ∈ (Unit‘𝑅)) → (Unit‘𝑆) ⊆ (Base‘𝑆))
51	45, 50	ssexd 4273	. . . . . 6 ⊢ ((𝐹 ∈ (𝑅 RingHom 𝑆) ∧ 𝐴 ∈ (Unit‘𝑅)) → (Unit‘𝑆) ∈ V)
52	38	mgpex 14223	. . . . . . 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 13483	. . . . 5 ⊢ ((𝐹 ∈ (𝑅 RingHom 𝑆) ∧ 𝐴 ∈ (Unit‘𝑅)) → (.r‘𝑆) = (+g‘((mulGrp‘𝑆) ↾s (Unit‘𝑆))))
55	54	oveqd 6102	. . . 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 6102	. . . 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 2253	. . 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 2238	. . . . . . 7 ⊢ ((mulGrp‘𝑆) ↾s (Unit‘𝑆)) = ((mulGrp‘𝑆) ↾s (Unit‘𝑆))
59	32, 58	unitgrp 14423	. . . . . 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 14484	. . . . . 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 14422	. . . . 5 ⊢ ((𝐹 ∈ (𝑅 RingHom 𝑆) ∧ 𝐴 ∈ (Unit‘𝑅)) → (Unit‘𝑆) = (Base‘((mulGrp‘𝑆) ↾s (Unit‘𝑆))))
65	63, 64	eleqtrd 2317	. . . 4 ⊢ ((𝐹 ∈ (𝑅 RingHom 𝑆) ∧ 𝐴 ∈ (Unit‘𝑅)) → (𝐹‘((invr‘𝑅)‘𝐴)) ∈ (Base‘((mulGrp‘𝑆) ↾s (Unit‘𝑆))))
66	32, 33	unitinvcl 14430	. . . . . 6 ⊢ ((𝑆 ∈ Ring ∧ (𝐹‘𝐴) ∈ (Unit‘𝑆)) → ((invr‘𝑆)‘(𝐹‘𝐴)) ∈ (Unit‘𝑆))
67	30, 31, 66	syl2anc 415	. . . . 5 ⊢ ((𝐹 ∈ (𝑅 RingHom 𝑆) ∧ 𝐴 ∈ (Unit‘𝑅)) → ((invr‘𝑆)‘(𝐹‘𝐴)) ∈ (Unit‘𝑆))
68	67, 64	eleqtrd 2317	. . . 4 ⊢ ((𝐹 ∈ (𝑅 RingHom 𝑆) ∧ 𝐴 ∈ (Unit‘𝑅)) → ((invr‘𝑆)‘(𝐹‘𝐴)) ∈ (Base‘((mulGrp‘𝑆) ↾s (Unit‘𝑆))))
69	31, 64	eleqtrd 2317	. . . 4 ⊢ ((𝐹 ∈ (𝑅 RingHom 𝑆) ∧ 𝐴 ∈ (Unit‘𝑅)) → (𝐹‘𝐴) ∈ (Base‘((mulGrp‘𝑆) ↾s (Unit‘𝑆))))
70		eqid 2238	. . . . 5 ⊢ (Base‘((mulGrp‘𝑆) ↾s (Unit‘𝑆))) = (Base‘((mulGrp‘𝑆) ↾s (Unit‘𝑆)))
71		eqid 2238	. . . . 5 ⊢ (+g‘((mulGrp‘𝑆) ↾s (Unit‘𝑆))) = (+g‘((mulGrp‘𝑆) ↾s (Unit‘𝑆)))
72	70, 71	grprcan 13842	. . . 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 1280	. . 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)))

This proof depends on syntax axioms:   → wi 4   ∧ wa 104   ↔ wb 105   = wceq 1402   ∈ wcel 2209  Vcvv 2821   Fn wfn 5372  ‘cfv 5377  (class class class)co 6085  Basecbs 13352   ↾_s cress 13353  +_gcplusg 13431  ._rcmulr 13432  Grpcgrp 13805  mulGrpcmgp 14217  1_rcur 14262  SRingcsrg 14267  Ringcrg 14300  Unitcui 14393  inv_rcinvr 14427   RingHom crh 14457

This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-in1 623  ax-in2 624  ax-io 721  ax-5 1500  ax-7 1501  ax-gen 1502  ax-ie1 1546  ax-ie2 1547  ax-8 1557  ax-10 1558  ax-11 1559  ax-i12 1560  ax-bndl 1562  ax-4 1563  ax-17 1579  ax-i9 1583  ax-ial 1587  ax-i5r 1588  ax-14 2212  ax-ext 2220  ax-coll 4246  ax-sep 4249  ax-nul 4259  ax-pow 4311  ax-pr 4346  ax-un 4578  ax-setind 4684  ax-cnex 8270  ax-resscn 8271  ax-1cn 8272  ax-1re 8273  ax-icn 8274  ax-addcl 8275  ax-addrcl 8276  ax-mulcl 8277  ax-addcom 8279  ax-addass 8281  ax-i2m1 8284  ax-0lt1 8285  ax-0id 8287  ax-rnegex 8288  ax-pre-ltirr 8291  ax-pre-lttrn 8293  ax-pre-ltadd 8295

This proof depends on definitions:  df-bi 117  df-3an 1011  df-tru 1405  df-fal 1408  df-nf 1514  df-sb 1816  df-eu 2089  df-mo 2090  df-clab 2225  df-cleq 2231  df-clel 2234  df-nfc 2381  df-ne 2421  df-nel 2516  df-ral 2533  df-rex 2534  df-reu 2535  df-rmo 2536  df-rab 2537  df-v 2823  df-sbc 3052  df-csb 3148  df-dif 3222  df-un 3224  df-in 3226  df-ss 3233  df-nul 3521  df-pw 3690  df-sn 3715  df-pr 3716  df-op 3718  df-uni 3936  df-int 3971  df-iun 4014  df-br 4131  df-opab 4193  df-mpt 4194  df-id 4438  df-xp 4780  df-rel 4781  df-cnv 4782  df-co 4783  df-dm 4784  df-rn 4785  df-res 4786  df-ima 4787  df-iota 5337  df-fun 5379  df-fn 5380  df-f 5381  df-f1 5382  df-fo 5383  df-f1o 5384  df-fv 5385  df-riota 6038  df-ov 6088  df-oprab 6089  df-mpo 6090  df-1st 6374  df-2nd 6375  df-tpos 6516  df-map 6924  df-pnf 8362  df-mnf 8363  df-ltxr 8365  df-inn 9305  df-2 9363  df-3 9364  df-ndx 13355  df-slot 13356  df-base 13358  df-sets 13359  df-iress 13360  df-plusg 13444  df-mulr 13445  df-0g 13612  df-mgm 13676  df-sgrp 13717  df-mnd 13730  df-mhm 13766  df-grp 13808  df-minusg 13809  df-ghm 14044  df-cmn 14089  df-abl 14090  df-mgp 14218  df-ur 14263  df-srg 14268  df-ring 14302  df-oppr 14373  df-dvdsr 14395  df-unit 14396  df-invr 14428  df-rhm 14459

This theorem is used by: (None)