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Theorem rinvf1o 30392
Description: Sufficient conditions for the restriction of an involution to be a bijection. (Contributed by Thierry Arnoux, 7-Dec-2016.)
Hypotheses
Ref Expression
rinvbij.1 Fun 𝐹
rinvbij.2 𝐹 = 𝐹
rinvbij.3a (𝐹𝐴) ⊆ 𝐵
rinvbij.3b (𝐹𝐵) ⊆ 𝐴
rinvbij.4a 𝐴 ⊆ dom 𝐹
rinvbij.4b 𝐵 ⊆ dom 𝐹
Assertion
Ref Expression
rinvf1o (𝐹𝐴):𝐴1-1-onto𝐵

Proof of Theorem rinvf1o
StepHypRef Expression
1 rinvbij.1 . . . . 5 Fun 𝐹
2 fdmrn 6516 . . . . 5 (Fun 𝐹𝐹:dom 𝐹⟶ran 𝐹)
31, 2mpbi 233 . . . 4 𝐹:dom 𝐹⟶ran 𝐹
4 rinvbij.2 . . . . . 6 𝐹 = 𝐹
54funeqi 6349 . . . . 5 (Fun 𝐹 ↔ Fun 𝐹)
61, 5mpbir 234 . . . 4 Fun 𝐹
7 df-f1 6333 . . . 4 (𝐹:dom 𝐹1-1→ran 𝐹 ↔ (𝐹:dom 𝐹⟶ran 𝐹 ∧ Fun 𝐹))
83, 6, 7mpbir2an 710 . . 3 𝐹:dom 𝐹1-1→ran 𝐹
9 rinvbij.4a . . 3 𝐴 ⊆ dom 𝐹
10 f1ores 6608 . . 3 ((𝐹:dom 𝐹1-1→ran 𝐹𝐴 ⊆ dom 𝐹) → (𝐹𝐴):𝐴1-1-onto→(𝐹𝐴))
118, 9, 10mp2an 691 . 2 (𝐹𝐴):𝐴1-1-onto→(𝐹𝐴)
12 rinvbij.3a . . . 4 (𝐹𝐴) ⊆ 𝐵
13 rinvbij.3b . . . . . 6 (𝐹𝐵) ⊆ 𝐴
14 rinvbij.4b . . . . . . 7 𝐵 ⊆ dom 𝐹
15 funimass3 6805 . . . . . . 7 ((Fun 𝐹𝐵 ⊆ dom 𝐹) → ((𝐹𝐵) ⊆ 𝐴𝐵 ⊆ (𝐹𝐴)))
161, 14, 15mp2an 691 . . . . . 6 ((𝐹𝐵) ⊆ 𝐴𝐵 ⊆ (𝐹𝐴))
1713, 16mpbi 233 . . . . 5 𝐵 ⊆ (𝐹𝐴)
184imaeq1i 5897 . . . . 5 (𝐹𝐴) = (𝐹𝐴)
1917, 18sseqtri 3954 . . . 4 𝐵 ⊆ (𝐹𝐴)
2012, 19eqssi 3934 . . 3 (𝐹𝐴) = 𝐵
21 f1oeq3 6585 . . 3 ((𝐹𝐴) = 𝐵 → ((𝐹𝐴):𝐴1-1-onto→(𝐹𝐴) ↔ (𝐹𝐴):𝐴1-1-onto𝐵))
2220, 21ax-mp 5 . 2 ((𝐹𝐴):𝐴1-1-onto→(𝐹𝐴) ↔ (𝐹𝐴):𝐴1-1-onto𝐵)
2311, 22mpbi 233 1 (𝐹𝐴):𝐴1-1-onto𝐵
Colors of variables: wff setvar class
Syntax hints:  wb 209   = wceq 1538  wss 3884  ccnv 5522  dom cdm 5523  ran crn 5524  cres 5525  cima 5526  Fun wfun 6322  wf 6324  1-1wf1 6325  1-1-ontowf1o 6327
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 2114  ax-9 2122  ax-10 2143  ax-11 2159  ax-12 2176  ax-ext 2773  ax-sep 5170  ax-nul 5177  ax-pr 5298
This theorem depends on definitions:  df-bi 210  df-an 400  df-or 845  df-3an 1086  df-tru 1541  df-ex 1782  df-nf 1786  df-sb 2070  df-mo 2601  df-eu 2632  df-clab 2780  df-cleq 2794  df-clel 2873  df-nfc 2941  df-ne 2991  df-ral 3114  df-rex 3115  df-rab 3118  df-v 3446  df-sbc 3724  df-dif 3887  df-un 3889  df-in 3891  df-ss 3901  df-nul 4247  df-if 4429  df-sn 4529  df-pr 4531  df-op 4535  df-uni 4804  df-br 5034  df-opab 5096  df-id 5428  df-xp 5529  df-rel 5530  df-cnv 5531  df-co 5532  df-dm 5533  df-rn 5534  df-res 5535  df-ima 5536  df-iota 6287  df-fun 6330  df-fn 6331  df-f 6332  df-f1 6333  df-fo 6334  df-f1o 6335  df-fv 6336
This theorem is referenced by:  ballotlem7  31901
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