Theorem relsnop 4876

Description: A singleton of an ordered pair is a relation. (Contributed by NM, 17-May-1998.) (Revised by Mario Carneiro, 26-Apr-2015.)

Hypotheses

Ref	Expression
relsn.1	|- A e. _V
relsnop.2	|- B e. _V

Assertion

Ref	Expression
relsnop	|- Rel { <. A , B >. }

Proof of Theorem relsnop

Step	Hyp	Ref	Expression
1		relsn.1	. . 3 |- A e. _V
2		relsnop.2	. . 3 |- B e. _V
3	1, 2	opelvv 4820	. 2 |- <. A , B >. e. ( _V X. _V )
4	1, 2	opex 4364	. . 3 |- <. A , B >. e. _V
5	4	relsn 4875	. 2 |- ( Rel { <. A , B >. } <-> <. A , B >. e. ( _V X. _V ) )
6	3, 5	mpbir 146	1 |- Rel { <. A , B >. }

Syntax hints:   e. wcel 2209   _Vcvv 2821   {csn 3705   <.cop 3708   X. cxp 4767   Rel wrel 4774

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-io 721  ax-5 1500  ax-7 1501  ax-gen 1502  ax-ie1 1546  ax-ie2 1547  ax-8 1557  ax-10 1558  ax-11 1559  ax-i12 1560  ax-bndl 1562  ax-4 1563  ax-17 1579  ax-i9 1583  ax-ial 1587  ax-i5r 1588  ax-14 2212  ax-ext 2220  ax-sep 4244  ax-pow 4306  ax-pr 4341

This theorem depends on definitions:  df-bi 117  df-3an 1011  df-tru 1405  df-nf 1514  df-sb 1816  df-clab 2225  df-cleq 2231  df-clel 2234  df-nfc 2381  df-ral 2533  df-rex 2534  df-v 2823  df-un 3224  df-in 3226  df-ss 3233  df-pw 3687  df-sn 3711  df-pr 3712  df-op 3714  df-opab 4188  df-xp 4775  df-rel 4776

This theorem is referenced by:  cnvsn  5265  fsn  5871