Theorem isrim0 14239

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 14238	. 2 ⊢ (𝐹 ∈ (𝑅 RingIso 𝑆) → (𝑅 ∈ V ∧ 𝑆 ∈ V))
2		rhmrcl1 14233	. . . . 5 ⊢ (𝐹 ∈ (𝑅 RingHom 𝑆) → 𝑅 ∈ Ring)
3	2	elexd 2817	. . . 4 ⊢ (𝐹 ∈ (𝑅 RingHom 𝑆) → 𝑅 ∈ V)
4		rhmrcl2 14234	. . . . 5 ⊢ (𝐹 ∈ (𝑅 RingHom 𝑆) → 𝑆 ∈ Ring)
5	4	elexd 2817	. . . 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 14231	. . . . . 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 6037	. . . . . . 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 6037	. . . . . . . . 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 2301	. . . . . 6 ⊢ (((𝑅 ∈ V ∧ 𝑆 ∈ V) ∧ (𝑟 = 𝑅 ∧ 𝑠 = 𝑆)) → (◡𝑓 ∈ (𝑠 RingHom 𝑟) ↔ ◡𝑓 ∈ (𝑆 RingHom 𝑅)))
16	11, 15	rabeqbidv 2798	. . . . 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 14235	. . . . . . 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 4238	. . . . . 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 6159	. . . 4 ⊢ ((𝑅 ∈ V ∧ 𝑆 ∈ V) → (𝑅 RingIso 𝑆) = {𝑓 ∈ (𝑅 RingHom 𝑆) ∣ ◡𝑓 ∈ (𝑆 RingHom 𝑅)})
24	23	eleq2d 2301	. . 3 ⊢ ((𝑅 ∈ V ∧ 𝑆 ∈ V) → (𝐹 ∈ (𝑅 RingIso 𝑆) ↔ 𝐹 ∈ {𝑓 ∈ (𝑅 RingHom 𝑆) ∣ ◡𝑓 ∈ (𝑆 RingHom 𝑅)}))
25		cnveq 4910	. . . . 5 ⊢ (𝑓 = 𝐹 → ◡𝑓 = ◡𝐹)
26	25	eleq1d 2300	. . . 4 ⊢ (𝑓 = 𝐹 → (◡𝑓 ∈ (𝑆 RingHom 𝑅) ↔ ◡𝐹 ∈ (𝑆 RingHom 𝑅)))
27	26	elrab 2963	. . 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 712	1 ⊢ (𝐹 ∈ (𝑅 RingIso 𝑆) ↔ (𝐹 ∈ (𝑅 RingHom 𝑆) ∧ ◡𝐹 ∈ (𝑆 RingHom 𝑅)))

Syntax hints:   ∧ wa 104   ↔ wb 105   = wceq 1398   ∈ wcel 2202  {crab 2515  Vcvv 2803  ^◡ccnv 4730  (class class class)co 6028   ∈ cmpo 6030  Ringcrg 14073   RingHom crh 14228   RingIso crs 14229

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 619  ax-in2 620  ax-io 717  ax-5 1496  ax-7 1497  ax-gen 1498  ax-ie1 1542  ax-ie2 1543  ax-8 1553  ax-10 1554  ax-11 1555  ax-i12 1556  ax-bndl 1558  ax-4 1559  ax-17 1575  ax-i9 1579  ax-ial 1583  ax-i5r 1584  ax-13 2204  ax-14 2205  ax-ext 2213  ax-coll 4209  ax-sep 4212  ax-pow 4270  ax-pr 4305  ax-un 4536  ax-setind 4641  ax-cnex 8166  ax-resscn 8167  ax-1cn 8168  ax-1re 8169  ax-icn 8170  ax-addcl 8171  ax-addrcl 8172  ax-mulcl 8173  ax-addcom 8175  ax-addass 8177  ax-i2m1 8180  ax-0lt1 8181  ax-0id 8183  ax-rnegex 8184  ax-pre-ltirr 8187  ax-pre-ltadd 8191

This theorem depends on definitions:  df-bi 117  df-3an 1007  df-tru 1401  df-fal 1404  df-nf 1510  df-sb 1811  df-eu 2082  df-mo 2083  df-clab 2218  df-cleq 2224  df-clel 2227  df-nfc 2364  df-ne 2404  df-nel 2499  df-ral 2516  df-rex 2517  df-reu 2518  df-rab 2520  df-v 2805  df-sbc 3033  df-csb 3129  df-dif 3203  df-un 3205  df-in 3207  df-ss 3214  df-nul 3497  df-pw 3658  df-sn 3679  df-pr 3680  df-op 3682  df-uni 3899  df-int 3934  df-iun 3977  df-br 4094  df-opab 4156  df-mpt 4157  df-id 4396  df-xp 4737  df-rel 4738  df-cnv 4739  df-co 4740  df-dm 4741  df-rn 4742  df-res 4743  df-ima 4744  df-iota 5293  df-fun 5335  df-fn 5336  df-f 5337  df-f1 5338  df-fo 5339  df-f1o 5340  df-fv 5341  df-ov 6031  df-oprab 6032  df-mpo 6033  df-1st 6312  df-2nd 6313  df-map 6862  df-pnf 8258  df-mnf 8259  df-ltxr 8261  df-inn 9186  df-2 9244  df-3 9245  df-ndx 13148  df-slot 13149  df-base 13151  df-sets 13152  df-plusg 13236  df-mulr 13237  df-mhm 13605  df-ghm 13891  df-mgp 13998  df-ur 14037  df-ring 14075  df-rhm 14230  df-rim 14231

This theorem is referenced by:  isrim  14247  rimrhm  14249