Theorem xpsn 6880

Description: The Cartesian product of two singletons is the singleton consisting in the associated ordered pair. (Contributed by NM, 4-Nov-2006.)

Hypotheses

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

Assertion

Ref	Expression
xpsn	⊢ ({𝐴} × {𝐵}) = {⟨𝐴, 𝐵⟩}

Proof of Theorem xpsn

Step	Hyp	Ref	Expression
1		xpsn.1	. 2 ⊢ 𝐴 ∈ V
2		xpsn.2	. 2 ⊢ 𝐵 ∈ V
3		xpsng 6878	. 2 ⊢ ((𝐴 ∈ V ∧ 𝐵 ∈ V) → ({𝐴} × {𝐵}) = {⟨𝐴, 𝐵⟩})
4	1, 2, 3	mp2an 691	1 ⊢ ({𝐴} × {𝐵}) = {⟨𝐴, 𝐵⟩}

Syntax hints:   = wceq 1538   ∈ wcel 2111  Vcvv 3441  {csn 4525  ⟨cop 4531   × cxp 5517

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 1911  ax-6 1970  ax-7 2015  ax-8 2113  ax-9 2121  ax-10 2142  ax-11 2158  ax-12 2175  ax-ext 2770  ax-sep 5167  ax-nul 5174  ax-pr 5295

This theorem depends on definitions:  df-bi 210  df-an 400  df-or 845  df-3an 1086  df-tru 1541  df-ex 1782  df-nf 1786  df-sb 2070  df-mo 2598  df-eu 2629  df-clab 2777  df-cleq 2791  df-clel 2870  df-nfc 2938  df-ne 2988  df-ral 3111  df-rex 3112  df-reu 3113  df-v 3443  df-dif 3884  df-un 3886  df-in 3888  df-ss 3898  df-nul 4244  df-if 4426  df-sn 4526  df-pr 4528  df-op 4532  df-br 5031  df-opab 5093  df-mpt 5111  df-id 5425  df-xp 5525  df-rel 5526  df-cnv 5527  df-co 5528  df-dm 5529  df-rn 5530  df-fun 6326  df-fn 6327  df-f 6328  df-f1 6329  df-fo 6330  df-f1o 6331

This theorem is referenced by:  dfmpt  6883  fpar  7794  mapsnconst  8439  ixpsnf1o  8485  dju1dif  9583  infdju1  9600  s1co  14186  mat1f1o  21083  txdis  22237  pt1hmeo  22411  utop2nei  22856  utop3cls  22857  imasdsf1olem  22980  ex-xp  28221  poimirlem3  35060  poimirlem4  35061  poimirlem9  35066  poimirlem28  35085  grposnOLD  35320  dib0  38460