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Theorem f1sng 6904
Description: A singleton of an ordered pair is a one-to-one function. (Contributed by AV, 17-Apr-2021.)
Assertion
Ref Expression
f1sng ((𝐴𝑉𝐵𝑊) → {⟨𝐴, 𝐵⟩}:{𝐴}–1-1𝑊)

Proof of Theorem f1sng
StepHypRef Expression
1 f1osng 6903 . . 3 ((𝐴𝑉𝐵𝑊) → {⟨𝐴, 𝐵⟩}:{𝐴}–1-1-onto→{𝐵})
2 f1of1 6861 . . 3 ({⟨𝐴, 𝐵⟩}:{𝐴}–1-1-onto→{𝐵} → {⟨𝐴, 𝐵⟩}:{𝐴}–1-1→{𝐵})
31, 2syl 17 . 2 ((𝐴𝑉𝐵𝑊) → {⟨𝐴, 𝐵⟩}:{𝐴}–1-1→{𝐵})
4 snssi 4833 . . 3 (𝐵𝑊 → {𝐵} ⊆ 𝑊)
54adantl 481 . 2 ((𝐴𝑉𝐵𝑊) → {𝐵} ⊆ 𝑊)
6 f1ss 6822 . 2 (({⟨𝐴, 𝐵⟩}:{𝐴}–1-1→{𝐵} ∧ {𝐵} ⊆ 𝑊) → {⟨𝐴, 𝐵⟩}:{𝐴}–1-1𝑊)
73, 5, 6syl2anc 583 1 ((𝐴𝑉𝐵𝑊) → {⟨𝐴, 𝐵⟩}:{𝐴}–1-1𝑊)
Colors of variables: wff setvar class
Syntax hints:  wi 4  wa 395  wcel 2108  wss 3976  {csn 4648  cop 4654  1-1wf1 6570  1-1-ontowf1o 6572
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1793  ax-4 1807  ax-5 1909  ax-6 1967  ax-7 2007  ax-8 2110  ax-9 2118  ax-ext 2711  ax-sep 5317  ax-nul 5324  ax-pr 5447
This theorem depends on definitions:  df-bi 207  df-an 396  df-or 847  df-3an 1089  df-tru 1540  df-fal 1550  df-ex 1778  df-sb 2065  df-mo 2543  df-clab 2718  df-cleq 2732  df-clel 2819  df-ral 3068  df-rex 3077  df-rab 3444  df-v 3490  df-dif 3979  df-un 3981  df-ss 3993  df-nul 4353  df-if 4549  df-sn 4649  df-pr 4651  df-op 4655  df-br 5167  df-opab 5229  df-id 5593  df-xp 5706  df-rel 5707  df-cnv 5708  df-co 5709  df-dm 5710  df-rn 5711  df-fun 6575  df-fn 6576  df-f 6577  df-f1 6578  df-fo 6579  df-f1o 6580
This theorem is referenced by:  fsnd  6905  uspgr1e  29279  0wlkons1  30153  f1sn2g  48564
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