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Theorem f1sng 6899
Description: A singleton of an ordered pair is a one-to-one function. (Contributed by AV, 17-Apr-2021.)
Assertion
Ref Expression
f1sng ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → {⟨𝐴, 𝐵⟩}:{𝐴}⟶1-1𝑊)

Proof of Theorem f1sng
StepHypRef Expression
1 f1osng 6898 . . 3 ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → {⟨𝐴, 𝐵⟩}:{𝐴}⟶1-1onto{𝐵})
2 f1of1 6853 . . 3 ({⟨𝐴, 𝐵⟩}:{𝐴}⟶1-1onto{𝐵} → {⟨𝐴, 𝐵⟩}:{𝐴}⟶1-1{𝐵})
31, 2syl 18 . 2 ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → {⟨𝐴, 𝐵⟩}:{𝐴}⟶1-1{𝐵})
4 snssi 4748 . . 3 (𝐵 ∈ 𝑊 → {𝐵} ⊆ 𝑊)
54adantl 487 . 2 ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → {𝐵} ⊆ 𝑊)
6 f1ss 6815 . 2 (({⟨𝐴, 𝐵⟩}:{𝐴}⟶1-1{𝐵} ∧ {𝐵} ⊆ 𝑊) → {⟨𝐴, 𝐵⟩}:{𝐴}⟶1-1𝑊)
73, 5, 6syl2anc 596 1 ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → {⟨𝐴, 𝐵⟩}:{𝐴}⟶1-1𝑊)
Colors of variables:    wff setvar class
This proof depends on syntax axioms:   → wi 4   ∧ wa 401   ∈ wcel 2147   ⊆ wss 3900  {csn 4588  ⟨cop 4840  ⟶1-1wf1 6563  ⟶1-1ontowf1o 6565
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 1945  ax-6 2002  ax-7 2043  ax-8 2149  ax-9 2157  ax-ext 2735  ax-sep 5255  ax-pr 5398
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-sb 2102  df-mo 2567  df-clab 2742  df-cleq 2755  df-clel 2839  df-ral 3081  df-rex 3091  df-rab 3417  df-v 3456  df-ss 3901  df-dif 4050  df-in 4094  df-un 4154  df-nul 4282  df-if 4486  df-sn 4589  df-pr 4591  df-op 4841  df-br 5109  df-opab 5174  df-id 5553  df-xp 5664  df-rel 5665  df-cnv 5666  df-co 5667  df-dm 5668  df-rn 5669  df-fun 6568  df-fn 6569  df-f 6570  df-f1 6571  df-fo 6572  df-f1o 6573
This theorem is used by:  fsnd  6900  uspgr1e  29882  0wlkons1  30769  f1sn2g  50293
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