Theorem funsn 6587

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 6585	. 2 ⊢ ((𝐴 ∈ V ∧ 𝐵 ∈ V) → Fun {⟨𝐴, 𝐵⟩})
4	1, 2, 3	mp2an 705	1 ⊢ Fun {⟨𝐴, 𝐵⟩}

This proof depends on syntax axioms:   ∈ wcel 2145  Vcvv 3450  {csn 4584  ⟨cop 4590  Fun wfun 6527

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 2147  ax-9 2155  ax-ext 2732  ax-sep 5251  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 2100  df-mo 2564  df-clab 2739  df-cleq 2752  df-clel 2835  df-ral 3077  df-rex 3087  df-rab 3413  df-v 3452  df-dif 3902  df-un 3904  df-in 3906  df-ss 3916  df-nul 4280  df-if 4483  df-sn 4585  df-pr 4587  df-op 4591  df-br 5104  df-opab 5168  df-id 5550  df-xp 5661  df-rel 5662  df-cnv 5663  df-co 5664  df-fun 6535

This theorem is used by:  funtp  6591  fun0  6599  funop  7147  funsndifnop  7149  dcomex  10452  axdc3lem4  10458  cnfldfunALT  21603  bnj1421  35554  funop1  48174