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Theorem smoiso 7988
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 𝐴𝐵 ⊆ On) → Smo 𝐹)

Proof of Theorem smoiso
Dummy variables 𝑥 𝑦 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 isof1o 7065 . . . 4 (𝐹 Isom E , E (𝐴, 𝐵) → 𝐹:𝐴1-1-onto𝐵)
2 f1of 6608 . . . 4 (𝐹:𝐴1-1-onto𝐵𝐹:𝐴𝐵)
31, 2syl 17 . . 3 (𝐹 Isom E , E (𝐴, 𝐵) → 𝐹:𝐴𝐵)
4 ffdm 6529 . . . . . 6 (𝐹:𝐴𝐵 → (𝐹:dom 𝐹𝐵 ∧ dom 𝐹𝐴))
54simpld 495 . . . . 5 (𝐹:𝐴𝐵𝐹:dom 𝐹𝐵)
6 fss 6520 . . . . 5 ((𝐹:dom 𝐹𝐵𝐵 ⊆ On) → 𝐹:dom 𝐹⟶On)
75, 6sylan 580 . . . 4 ((𝐹:𝐴𝐵𝐵 ⊆ On) → 𝐹:dom 𝐹⟶On)
873adant2 1123 . . 3 ((𝐹:𝐴𝐵 ∧ Ord 𝐴𝐵 ⊆ On) → 𝐹:dom 𝐹⟶On)
93, 8syl3an1 1155 . 2 ((𝐹 Isom E , E (𝐴, 𝐵) ∧ Ord 𝐴𝐵 ⊆ On) → 𝐹:dom 𝐹⟶On)
10 fdm 6515 . . . . . 6 (𝐹:𝐴𝐵 → dom 𝐹 = 𝐴)
1110eqcomd 2824 . . . . 5 (𝐹:𝐴𝐵𝐴 = dom 𝐹)
12 ordeq 6191 . . . . 5 (𝐴 = dom 𝐹 → (Ord 𝐴 ↔ Ord dom 𝐹))
131, 2, 11, 124syl 19 . . . 4 (𝐹 Isom E , E (𝐴, 𝐵) → (Ord 𝐴 ↔ Ord dom 𝐹))
1413biimpa 477 . . 3 ((𝐹 Isom E , E (𝐴, 𝐵) ∧ Ord 𝐴) → Ord dom 𝐹)
15143adant3 1124 . 2 ((𝐹 Isom E , E (𝐴, 𝐵) ∧ Ord 𝐴𝐵 ⊆ On) → Ord dom 𝐹)
1610eleq2d 2895 . . . . . . 7 (𝐹:𝐴𝐵 → (𝑥 ∈ dom 𝐹𝑥𝐴))
1710eleq2d 2895 . . . . . . 7 (𝐹:𝐴𝐵 → (𝑦 ∈ dom 𝐹𝑦𝐴))
1816, 17anbi12d 630 . . . . . 6 (𝐹:𝐴𝐵 → ((𝑥 ∈ dom 𝐹𝑦 ∈ dom 𝐹) ↔ (𝑥𝐴𝑦𝐴)))
191, 2, 183syl 18 . . . . 5 (𝐹 Isom E , E (𝐴, 𝐵) → ((𝑥 ∈ dom 𝐹𝑦 ∈ dom 𝐹) ↔ (𝑥𝐴𝑦𝐴)))
20 isorel 7068 . . . . . . . 8 ((𝐹 Isom E , E (𝐴, 𝐵) ∧ (𝑥𝐴𝑦𝐴)) → (𝑥 E 𝑦 ↔ (𝐹𝑥) E (𝐹𝑦)))
21 epel 5462 . . . . . . . 8 (𝑥 E 𝑦𝑥𝑦)
22 fvex 6676 . . . . . . . . 9 (𝐹𝑦) ∈ V
2322epeli 5461 . . . . . . . 8 ((𝐹𝑥) E (𝐹𝑦) ↔ (𝐹𝑥) ∈ (𝐹𝑦))
2420, 21, 233bitr3g 314 . . . . . . 7 ((𝐹 Isom E , E (𝐴, 𝐵) ∧ (𝑥𝐴𝑦𝐴)) → (𝑥𝑦 ↔ (𝐹𝑥) ∈ (𝐹𝑦)))
2524biimpd 230 . . . . . 6 ((𝐹 Isom E , E (𝐴, 𝐵) ∧ (𝑥𝐴𝑦𝐴)) → (𝑥𝑦 → (𝐹𝑥) ∈ (𝐹𝑦)))
2625ex 413 . . . . 5 (𝐹 Isom E , E (𝐴, 𝐵) → ((𝑥𝐴𝑦𝐴) → (𝑥𝑦 → (𝐹𝑥) ∈ (𝐹𝑦))))
2719, 26sylbid 241 . . . 4 (𝐹 Isom E , E (𝐴, 𝐵) → ((𝑥 ∈ dom 𝐹𝑦 ∈ dom 𝐹) → (𝑥𝑦 → (𝐹𝑥) ∈ (𝐹𝑦))))
2827ralrimivv 3187 . . 3 (𝐹 Isom E , E (𝐴, 𝐵) → ∀𝑥 ∈ dom 𝐹𝑦 ∈ dom 𝐹(𝑥𝑦 → (𝐹𝑥) ∈ (𝐹𝑦)))
29283ad2ant1 1125 . 2 ((𝐹 Isom E , E (𝐴, 𝐵) ∧ Ord 𝐴𝐵 ⊆ On) → ∀𝑥 ∈ dom 𝐹𝑦 ∈ dom 𝐹(𝑥𝑦 → (𝐹𝑥) ∈ (𝐹𝑦)))
30 df-smo 7972 . 2 (Smo 𝐹 ↔ (𝐹:dom 𝐹⟶On ∧ Ord dom 𝐹 ∧ ∀𝑥 ∈ dom 𝐹𝑦 ∈ dom 𝐹(𝑥𝑦 → (𝐹𝑥) ∈ (𝐹𝑦))))
319, 15, 29, 30syl3anbrc 1335 1 ((𝐹 Isom E , E (𝐴, 𝐵) ∧ Ord 𝐴𝐵 ⊆ On) → Smo 𝐹)
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 207  wa 396  w3a 1079   = wceq 1528  wcel 2105  wral 3135  wss 3933   class class class wbr 5057   E cep 5457  dom cdm 5548  Ord word 6183  Oncon0 6184  wf 6344  1-1-ontowf1o 6347  cfv 6348   Isom wiso 6349  Smo wsmo 7971
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1787  ax-4 1801  ax-5 1902  ax-6 1961  ax-7 2006  ax-8 2107  ax-9 2115  ax-10 2136  ax-11 2151  ax-12 2167  ax-ext 2790  ax-sep 5194  ax-nul 5201  ax-pr 5320
This theorem depends on definitions:  df-bi 208  df-an 397  df-or 842  df-3an 1081  df-tru 1531  df-ex 1772  df-nf 1776  df-sb 2061  df-mo 2615  df-eu 2647  df-clab 2797  df-cleq 2811  df-clel 2890  df-nfc 2960  df-ne 3014  df-ral 3140  df-rex 3141  df-rab 3144  df-v 3494  df-sbc 3770  df-dif 3936  df-un 3938  df-in 3940  df-ss 3949  df-nul 4289  df-if 4464  df-sn 4558  df-pr 4560  df-op 4564  df-uni 4831  df-br 5058  df-opab 5120  df-tr 5164  df-eprel 5458  df-po 5467  df-so 5468  df-fr 5507  df-we 5509  df-ord 6187  df-iota 6307  df-fn 6351  df-f 6352  df-f1 6353  df-f1o 6355  df-fv 6356  df-isom 6357  df-smo 7972
This theorem is referenced by:  smoiso2  7995
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