Theorem funsn 6538

Description: A singleton of an ordered pair is a function. Theorem 10.5 of [Quine] p. 65. (Contributed by NM, 12-Aug-1994.)

Hypotheses

Ref	Expression
funsn.1	⊢ 𝐴 ∈ V
funsn.2	⊢ 𝐵 ∈ V

Assertion

Ref	Expression
funsn	⊢ Fun {⟨𝐴, 𝐵⟩}

Proof of Theorem funsn

Step	Hyp	Ref	Expression
1		funsn.1	. 2 ⊢ 𝐴 ∈ V
2		funsn.2	. 2 ⊢ 𝐵 ∈ V
3		funsng 6536	. 2 ⊢ ((𝐴 ∈ V ∧ 𝐵 ∈ V) → Fun {⟨𝐴, 𝐵⟩})
4	1, 2, 3	mp2an 698	1 ⊢ Fun {⟨𝐴, 𝐵⟩}

Syntax hints:   ∈ wcel 2119  Vcvv 3431  {csn 4555  ⟨cop 4561  Fun wfun 6479

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1802  ax-4 1816  ax-5 1917  ax-6 1974  ax-7 2015  ax-8 2121  ax-9 2129  ax-ext 2711  ax-sep 5218  ax-pr 5362

This theorem depends on definitions:  df-bi 208  df-an 397  df-or 854  df-3an 1094  df-tru 1550  df-fal 1560  df-ex 1787  df-sb 2074  df-mo 2543  df-clab 2718  df-cleq 2731  df-clel 2814  df-ral 3054  df-rex 3064  df-rab 3392  df-v 3433  df-dif 3886  df-un 3888  df-in 3890  df-ss 3900  df-nul 4262  df-if 4455  df-sn 4556  df-pr 4558  df-op 4562  df-br 5073  df-opab 5135  df-id 5513  df-xp 5624  df-rel 5625  df-cnv 5626  df-co 5627  df-fun 6487

This theorem is referenced by:  funtp  6542  fun0  6550  funop  7092  funsndifnop  7094  dcomex  10360  axdc3lem4  10366  cnfldfunALT  21362  bnj1421  35224  funop1  47746