Theorem isrim0 13993

Description: A ring isomorphism is a homomorphism whose converse is also a homomorphism. (Contributed by AV, 22-Oct-2019.) Remove sethood antecedent. (Revised by SN, 10-Jan-2025.)

Assertion

Ref	Expression
isrim0	⊢ (𝐹 ∈ (𝑅 RingIso 𝑆) ↔ (𝐹 ∈ (𝑅 RingHom 𝑆) ∧ ◡𝐹 ∈ (𝑆 RingHom 𝑅)))

Proof of Theorem isrim0

Dummy variables 𝑓 𝑟 𝑠 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		rimrcl 13992	. 2 ⊢ (𝐹 ∈ (𝑅 RingIso 𝑆) → (𝑅 ∈ V ∧ 𝑆 ∈ V))
2		rhmrcl1 13987	. . . . 5 ⊢ (𝐹 ∈ (𝑅 RingHom 𝑆) → 𝑅 ∈ Ring)
3	2	elexd 2787	. . . 4 ⊢ (𝐹 ∈ (𝑅 RingHom 𝑆) → 𝑅 ∈ V)
4		rhmrcl2 13988	. . . . 5 ⊢ (𝐹 ∈ (𝑅 RingHom 𝑆) → 𝑆 ∈ Ring)
5	4	elexd 2787	. . . 4 ⊢ (𝐹 ∈ (𝑅 RingHom 𝑆) → 𝑆 ∈ V)
6	3, 5	jca 306	. . 3 ⊢ (𝐹 ∈ (𝑅 RingHom 𝑆) → (𝑅 ∈ V ∧ 𝑆 ∈ V))
7	6	adantr 276	. 2 ⊢ ((𝐹 ∈ (𝑅 RingHom 𝑆) ∧ ◡𝐹 ∈ (𝑆 RingHom 𝑅)) → (𝑅 ∈ V ∧ 𝑆 ∈ V))
8		df-rim 13985	. . . . . 6 ⊢ RingIso = (𝑟 ∈ V, 𝑠 ∈ V ↦ {𝑓 ∈ (𝑟 RingHom 𝑠) ∣ ◡𝑓 ∈ (𝑠 RingHom 𝑟)})
9	8	a1i 9	. . . . 5 ⊢ ((𝑅 ∈ V ∧ 𝑆 ∈ V) → RingIso = (𝑟 ∈ V, 𝑠 ∈ V ↦ {𝑓 ∈ (𝑟 RingHom 𝑠) ∣ ◡𝑓 ∈ (𝑠 RingHom 𝑟)}))
10		oveq12 5965	. . . . . . 7 ⊢ ((𝑟 = 𝑅 ∧ 𝑠 = 𝑆) → (𝑟 RingHom 𝑠) = (𝑅 RingHom 𝑆))
11	10	adantl 277	. . . . . 6 ⊢ (((𝑅 ∈ V ∧ 𝑆 ∈ V) ∧ (𝑟 = 𝑅 ∧ 𝑠 = 𝑆)) → (𝑟 RingHom 𝑠) = (𝑅 RingHom 𝑆))
12		oveq12 5965	. . . . . . . . 9 ⊢ ((𝑠 = 𝑆 ∧ 𝑟 = 𝑅) → (𝑠 RingHom 𝑟) = (𝑆 RingHom 𝑅))
13	12	ancoms 268	. . . . . . . 8 ⊢ ((𝑟 = 𝑅 ∧ 𝑠 = 𝑆) → (𝑠 RingHom 𝑟) = (𝑆 RingHom 𝑅))
14	13	adantl 277	. . . . . . 7 ⊢ (((𝑅 ∈ V ∧ 𝑆 ∈ V) ∧ (𝑟 = 𝑅 ∧ 𝑠 = 𝑆)) → (𝑠 RingHom 𝑟) = (𝑆 RingHom 𝑅))
15	14	eleq2d 2276	. . . . . 6 ⊢ (((𝑅 ∈ V ∧ 𝑆 ∈ V) ∧ (𝑟 = 𝑅 ∧ 𝑠 = 𝑆)) → (◡𝑓 ∈ (𝑠 RingHom 𝑟) ↔ ◡𝑓 ∈ (𝑆 RingHom 𝑅)))
16	11, 15	rabeqbidv 2768	. . . . 5 ⊢ (((𝑅 ∈ V ∧ 𝑆 ∈ V) ∧ (𝑟 = 𝑅 ∧ 𝑠 = 𝑆)) → {𝑓 ∈ (𝑟 RingHom 𝑠) ∣ ◡𝑓 ∈ (𝑠 RingHom 𝑟)} = {𝑓 ∈ (𝑅 RingHom 𝑆) ∣ ◡𝑓 ∈ (𝑆 RingHom 𝑅)})
17		simpl 109	. . . . 5 ⊢ ((𝑅 ∈ V ∧ 𝑆 ∈ V) → 𝑅 ∈ V)
18		simpr 110	. . . . 5 ⊢ ((𝑅 ∈ V ∧ 𝑆 ∈ V) → 𝑆 ∈ V)
19		rhmex 13989	. . . . . . 7 ⊢ ((𝑅 ∈ V ∧ 𝑆 ∈ V) → (𝑅 RingHom 𝑆) ∈ V)
20	17, 18, 19	syl2anc 411	. . . . . 6 ⊢ ((𝑅 ∈ V ∧ 𝑆 ∈ V) → (𝑅 RingHom 𝑆) ∈ V)
21		rabexg 4194	. . . . . 6 ⊢ ((𝑅 RingHom 𝑆) ∈ V → {𝑓 ∈ (𝑅 RingHom 𝑆) ∣ ◡𝑓 ∈ (𝑆 RingHom 𝑅)} ∈ V)
22	20, 21	syl 14	. . . . 5 ⊢ ((𝑅 ∈ V ∧ 𝑆 ∈ V) → {𝑓 ∈ (𝑅 RingHom 𝑆) ∣ ◡𝑓 ∈ (𝑆 RingHom 𝑅)} ∈ V)
23	9, 16, 17, 18, 22	ovmpod 6085	. . . 4 ⊢ ((𝑅 ∈ V ∧ 𝑆 ∈ V) → (𝑅 RingIso 𝑆) = {𝑓 ∈ (𝑅 RingHom 𝑆) ∣ ◡𝑓 ∈ (𝑆 RingHom 𝑅)})
24	23	eleq2d 2276	. . 3 ⊢ ((𝑅 ∈ V ∧ 𝑆 ∈ V) → (𝐹 ∈ (𝑅 RingIso 𝑆) ↔ 𝐹 ∈ {𝑓 ∈ (𝑅 RingHom 𝑆) ∣ ◡𝑓 ∈ (𝑆 RingHom 𝑅)}))
25		cnveq 4859	. . . . 5 ⊢ (𝑓 = 𝐹 → ◡𝑓 = ◡𝐹)
26	25	eleq1d 2275	. . . 4 ⊢ (𝑓 = 𝐹 → (◡𝑓 ∈ (𝑆 RingHom 𝑅) ↔ ◡𝐹 ∈ (𝑆 RingHom 𝑅)))
27	26	elrab 2933	. . 3 ⊢ (𝐹 ∈ {𝑓 ∈ (𝑅 RingHom 𝑆) ∣ ◡𝑓 ∈ (𝑆 RingHom 𝑅)} ↔ (𝐹 ∈ (𝑅 RingHom 𝑆) ∧ ◡𝐹 ∈ (𝑆 RingHom 𝑅)))
28	24, 27	bitrdi 196	. 2 ⊢ ((𝑅 ∈ V ∧ 𝑆 ∈ V) → (𝐹 ∈ (𝑅 RingIso 𝑆) ↔ (𝐹 ∈ (𝑅 RingHom 𝑆) ∧ ◡𝐹 ∈ (𝑆 RingHom 𝑅))))
29	1, 7, 28	pm5.21nii 706	1 ⊢ (𝐹 ∈ (𝑅 RingIso 𝑆) ↔ (𝐹 ∈ (𝑅 RingHom 𝑆) ∧ ◡𝐹 ∈ (𝑆 RingHom 𝑅)))

Syntax hints:   ∧ wa 104   ↔ wb 105   = wceq 1373   ∈ wcel 2177  {crab 2489  Vcvv 2773  ^◡ccnv 4681  (class class class)co 5956   ∈ cmpo 5958  Ringcrg 13828   RingHom crh 13982   RingIso crs 13983

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 4166  ax-sep 4169  ax-pow 4225  ax-pr 4260  ax-un 4487  ax-setind 4592  ax-cnex 8031  ax-resscn 8032  ax-1cn 8033  ax-1re 8034  ax-icn 8035  ax-addcl 8036  ax-addrcl 8037  ax-mulcl 8038  ax-addcom 8040  ax-addass 8042  ax-i2m1 8045  ax-0lt1 8046  ax-0id 8048  ax-rnegex 8049  ax-pre-ltirr 8052  ax-pre-ltadd 8056

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-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 3622  df-sn 3643  df-pr 3644  df-op 3646  df-uni 3856  df-int 3891  df-iun 3934  df-br 4051  df-opab 4113  df-mpt 4114  df-id 4347  df-xp 4688  df-rel 4689  df-cnv 4690  df-co 4691  df-dm 4692  df-rn 4693  df-res 4694  df-ima 4695  df-iota 5240  df-fun 5281  df-fn 5282  df-f 5283  df-f1 5284  df-fo 5285  df-f1o 5286  df-fv 5287  df-ov 5959  df-oprab 5960  df-mpo 5961  df-1st 6238  df-2nd 6239  df-map 6749  df-pnf 8124  df-mnf 8125  df-ltxr 8127  df-inn 9052  df-2 9110  df-3 9111  df-ndx 12905  df-slot 12906  df-base 12908  df-sets 12909  df-plusg 12992  df-mulr 12993  df-mhm 13361  df-ghm 13647  df-mgp 13753  df-ur 13792  df-ring 13830  df-rhm 13984  df-rim 13985

This theorem is referenced by:  isrim  14001  rimrhm  14003