Theorem smoiso 8009

Description: If 𝐹 is an isomorphism from an ordinal 𝐴 onto 𝐵, which is a subset of the ordinals, then 𝐹 is a strictly monotonic function. Exercise 3 in [TakeutiZaring] p. 50. (Contributed by Andrew Salmon, 24-Nov-2011.)

Assertion

Ref	Expression
smoiso	⊢ ((𝐹 Isom E , E (𝐴, 𝐵) ∧ Ord 𝐴 ∧ 𝐵 ⊆ On) → Smo 𝐹)

Proof of Theorem smoiso

Dummy variables 𝑥 𝑦 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		isof1o 7070	. . . 4 ⊢ (𝐹 Isom E , E (𝐴, 𝐵) → 𝐹:𝐴–1-1-onto→𝐵)
2		f1of 6602	. . . 4 ⊢ (𝐹:𝐴–1-1-onto→𝐵 → 𝐹:𝐴⟶𝐵)
3	1, 2	syl 17	. . 3 ⊢ (𝐹 Isom E , E (𝐴, 𝐵) → 𝐹:𝐴⟶𝐵)
4		ffdm 6521	. . . . . 6 ⊢ (𝐹:𝐴⟶𝐵 → (𝐹:dom 𝐹⟶𝐵 ∧ dom 𝐹 ⊆ 𝐴))
5	4	simpld 498	. . . . 5 ⊢ (𝐹:𝐴⟶𝐵 → 𝐹:dom 𝐹⟶𝐵)
6		fss 6512	. . . . 5 ⊢ ((𝐹:dom 𝐹⟶𝐵 ∧ 𝐵 ⊆ On) → 𝐹:dom 𝐹⟶On)
7	5, 6	sylan 583	. . . 4 ⊢ ((𝐹:𝐴⟶𝐵 ∧ 𝐵 ⊆ On) → 𝐹:dom 𝐹⟶On)
8	7	3adant2 1128	. . 3 ⊢ ((𝐹:𝐴⟶𝐵 ∧ Ord 𝐴 ∧ 𝐵 ⊆ On) → 𝐹:dom 𝐹⟶On)
9	3, 8	syl3an1 1160	. 2 ⊢ ((𝐹 Isom E , E (𝐴, 𝐵) ∧ Ord 𝐴 ∧ 𝐵 ⊆ On) → 𝐹:dom 𝐹⟶On)
10		fdm 6506	. . . . . 6 ⊢ (𝐹:𝐴⟶𝐵 → dom 𝐹 = 𝐴)
11	10	eqcomd 2764	. . . . 5 ⊢ (𝐹:𝐴⟶𝐵 → 𝐴 = dom 𝐹)
12		ordeq 6176	. . . . 5 ⊢ (𝐴 = dom 𝐹 → (Ord 𝐴 ↔ Ord dom 𝐹))
13	1, 2, 11, 12	4syl 19	. . . 4 ⊢ (𝐹 Isom E , E (𝐴, 𝐵) → (Ord 𝐴 ↔ Ord dom 𝐹))
14	13	biimpa 480	. . 3 ⊢ ((𝐹 Isom E , E (𝐴, 𝐵) ∧ Ord 𝐴) → Ord dom 𝐹)
15	14	3adant3 1129	. 2 ⊢ ((𝐹 Isom E , E (𝐴, 𝐵) ∧ Ord 𝐴 ∧ 𝐵 ⊆ On) → Ord dom 𝐹)
16	10	eleq2d 2837	. . . . . . 7 ⊢ (𝐹:𝐴⟶𝐵 → (𝑥 ∈ dom 𝐹 ↔ 𝑥 ∈ 𝐴))
17	10	eleq2d 2837	. . . . . . 7 ⊢ (𝐹:𝐴⟶𝐵 → (𝑦 ∈ dom 𝐹 ↔ 𝑦 ∈ 𝐴))
18	16, 17	anbi12d 633	. . . . . 6 ⊢ (𝐹:𝐴⟶𝐵 → ((𝑥 ∈ dom 𝐹 ∧ 𝑦 ∈ dom 𝐹) ↔ (𝑥 ∈ 𝐴 ∧ 𝑦 ∈ 𝐴)))
19	1, 2, 18	3syl 18	. . . . 5 ⊢ (𝐹 Isom E , E (𝐴, 𝐵) → ((𝑥 ∈ dom 𝐹 ∧ 𝑦 ∈ dom 𝐹) ↔ (𝑥 ∈ 𝐴 ∧ 𝑦 ∈ 𝐴)))
20		isorel 7073	. . . . . . . 8 ⊢ ((𝐹 Isom E , E (𝐴, 𝐵) ∧ (𝑥 ∈ 𝐴 ∧ 𝑦 ∈ 𝐴)) → (𝑥 E 𝑦 ↔ (𝐹‘𝑥) E (𝐹‘𝑦)))
21		epel 5438	. . . . . . . 8 ⊢ (𝑥 E 𝑦 ↔ 𝑥 ∈ 𝑦)
22		fvex 6671	. . . . . . . . 9 ⊢ (𝐹‘𝑦) ∈ V
23	22	epeli 5437	. . . . . . . 8 ⊢ ((𝐹‘𝑥) E (𝐹‘𝑦) ↔ (𝐹‘𝑥) ∈ (𝐹‘𝑦))
24	20, 21, 23	3bitr3g 316	. . . . . . 7 ⊢ ((𝐹 Isom E , E (𝐴, 𝐵) ∧ (𝑥 ∈ 𝐴 ∧ 𝑦 ∈ 𝐴)) → (𝑥 ∈ 𝑦 ↔ (𝐹‘𝑥) ∈ (𝐹‘𝑦)))
25	24	biimpd 232	. . . . . 6 ⊢ ((𝐹 Isom E , E (𝐴, 𝐵) ∧ (𝑥 ∈ 𝐴 ∧ 𝑦 ∈ 𝐴)) → (𝑥 ∈ 𝑦 → (𝐹‘𝑥) ∈ (𝐹‘𝑦)))
26	25	ex 416	. . . . 5 ⊢ (𝐹 Isom E , E (𝐴, 𝐵) → ((𝑥 ∈ 𝐴 ∧ 𝑦 ∈ 𝐴) → (𝑥 ∈ 𝑦 → (𝐹‘𝑥) ∈ (𝐹‘𝑦))))
27	19, 26	sylbid 243	. . . 4 ⊢ (𝐹 Isom E , E (𝐴, 𝐵) → ((𝑥 ∈ dom 𝐹 ∧ 𝑦 ∈ dom 𝐹) → (𝑥 ∈ 𝑦 → (𝐹‘𝑥) ∈ (𝐹‘𝑦))))
28	27	ralrimivv 3119	. . 3 ⊢ (𝐹 Isom E , E (𝐴, 𝐵) → ∀𝑥 ∈ dom 𝐹∀𝑦 ∈ dom 𝐹(𝑥 ∈ 𝑦 → (𝐹‘𝑥) ∈ (𝐹‘𝑦)))
29	28	3ad2ant1 1130	. 2 ⊢ ((𝐹 Isom E , E (𝐴, 𝐵) ∧ Ord 𝐴 ∧ 𝐵 ⊆ On) → ∀𝑥 ∈ dom 𝐹∀𝑦 ∈ dom 𝐹(𝑥 ∈ 𝑦 → (𝐹‘𝑥) ∈ (𝐹‘𝑦)))
30		df-smo 7993	. 2 ⊢ (Smo 𝐹 ↔ (𝐹:dom 𝐹⟶On ∧ Ord dom 𝐹 ∧ ∀𝑥 ∈ dom 𝐹∀𝑦 ∈ dom 𝐹(𝑥 ∈ 𝑦 → (𝐹‘𝑥) ∈ (𝐹‘𝑦))))
31	9, 15, 29, 30	syl3anbrc 1340	1 ⊢ ((𝐹 Isom E , E (𝐴, 𝐵) ∧ Ord 𝐴 ∧ 𝐵 ⊆ On) → Smo 𝐹)

Syntax hints:   → wi 4   ↔ wb 209   ∧ wa 399   ∧ w3a 1084   = wceq 1538   ∈ wcel 2111  ∀wral 3070   ⊆ wss 3858   class class class wbr 5032   E cep 5434  dom cdm 5524  Ord word 6168  Oncon0 6169  ⟶wf 6331  –1-1-onto→wf1o 6334  ‘cfv 6335   Isom wiso 6336  Smo wsmo 7992

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 1911  ax-6 1970  ax-7 2015  ax-8 2113  ax-9 2121  ax-10 2142  ax-11 2158  ax-12 2175  ax-ext 2729  ax-sep 5169  ax-nul 5176  ax-pr 5298

This theorem depends on definitions:  df-bi 210  df-an 400  df-or 845  df-3an 1086  df-tru 1541  df-fal 1551  df-ex 1782  df-nf 1786  df-sb 2070  df-mo 2557  df-eu 2588  df-clab 2736  df-cleq 2750  df-clel 2830  df-nfc 2901  df-ne 2952  df-ral 3075  df-rex 3076  df-v 3411  df-sbc 3697  df-dif 3861  df-un 3863  df-in 3865  df-ss 3875  df-nul 4226  df-if 4421  df-sn 4523  df-pr 4525  df-op 4529  df-uni 4799  df-br 5033  df-opab 5095  df-tr 5139  df-eprel 5435  df-po 5443  df-so 5444  df-fr 5483  df-we 5485  df-ord 6172  df-iota 6294  df-fn 6338  df-f 6339  df-f1 6340  df-f1o 6342  df-fv 6343  df-isom 6344  df-smo 7993

This theorem is referenced by:  smoiso2  8016