Theorem funsn 6553

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 6551	. 2 ⊢ ((𝐴 ∈ V ∧ 𝐵 ∈ V) → Fun {⟨𝐴, 𝐵⟩})
4	1, 2, 3	mp2an 693	1 ⊢ Fun {⟨𝐴, 𝐵⟩}

Syntax hints:   ∈ wcel 2114  Vcvv 3442  {csn 4582  ⟨cop 4588  Fun wfun 6494

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 1912  ax-6 1969  ax-7 2010  ax-8 2116  ax-9 2124  ax-ext 2709  ax-sep 5243  ax-pr 5379

This theorem depends on definitions:  df-bi 207  df-an 396  df-or 849  df-3an 1089  df-tru 1545  df-fal 1555  df-ex 1782  df-sb 2069  df-mo 2540  df-clab 2716  df-cleq 2729  df-clel 2812  df-ral 3053  df-rex 3063  df-rab 3402  df-v 3444  df-dif 3906  df-un 3908  df-in 3910  df-ss 3920  df-nul 4288  df-if 4482  df-sn 4583  df-pr 4585  df-op 4589  df-br 5101  df-opab 5163  df-id 5527  df-xp 5638  df-rel 5639  df-cnv 5640  df-co 5641  df-fun 6502

This theorem is referenced by:  funtp  6557  fun0  6565  funop  7104  funsndifnop  7106  dcomex  10369  axdc3lem4  10375  cnfldfunALT  21336  cnfldfunALTOLD  21349  bnj1421  35218  funop1  47643