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Theorem inlresf1 9917
Description: The left injection restricted to the left class of a disjoint union is an injective function from the left class into the disjoint union. (Contributed by AV, 28-Jun-2022.)
Assertion
Ref Expression
inlresf1 (inl ↾ 𝐴):𝐴1-1→(𝐴𝐵)

Proof of Theorem inlresf1
StepHypRef Expression
1 djulf1o 9914 . . 3 inl:V–1-1-onto→({∅} × V)
2 f1of1 6823 . . 3 (inl:V–1-1-onto→({∅} × V) → inl:V–1-1→({∅} × V))
31, 2ax-mp 5 . 2 inl:V–1-1→({∅} × V)
4 ssv 3962 . 2 𝐴 ⊆ V
5 inlresf 9916 . 2 (inl ↾ 𝐴):𝐴⟶(𝐴𝐵)
6 f1resf1 6788 . 2 ((inl:V–1-1→({∅} × V) ∧ 𝐴 ⊆ V ∧ (inl ↾ 𝐴):𝐴⟶(𝐴𝐵)) → (inl ↾ 𝐴):𝐴1-1→(𝐴𝐵))
73, 4, 5, 6mp3an 1490 1 (inl ↾ 𝐴):𝐴1-1→(𝐴𝐵)
Colors of variables:    wff setvar class
This proof depends on syntax axioms:  Vcvv 3457  wss 3906  c0 4286  {csn 4591   × cxp 5661  cres 5665  wf 6536  1-1wf1 6537  1-1-ontowf1o 6539  cdju 9900  inlcinl 9901
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1828  ax-4 1842  ax-5 1943  ax-6 2000  ax-7 2041  ax-8 2148  ax-9 2156  ax-10 2179  ax-11 2195  ax-12 2216  ax-ext 2737  ax-sep 5259  ax-nul 5271  ax-pr 5406  ax-un 7742
This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1813  df-nf 1817  df-sb 2100  df-mo 2569  df-eu 2599  df-clab 2744  df-cleq 2757  df-clel 2840  df-nfc 2914  df-ne 2961  df-ral 3082  df-rex 3092  df-rab 3419  df-v 3459  df-dif 3909  df-un 3911  df-in 3913  df-ss 3923  df-nul 4287  df-if 4490  df-sn 4592  df-pr 4594  df-op 4598  df-uni 4875  df-br 5112  df-opab 5176  df-mpt 5195  df-id 5558  df-xp 5669  df-rel 5670  df-cnv 5671  df-co 5672  df-dm 5673  df-rn 5674  df-res 5675  df-iota 6496  df-fun 6542  df-fn 6543  df-f 6544  df-f1 6545  df-fo 6546  df-f1o 6547  df-fv 6548  df-1st 7992  df-2nd 7993  df-dju 9903  df-inl 9904
This theorem is used by: (None)
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