Theorem elrel 4828

Description: A member of a relation is an ordered pair. (Contributed by NM, 17-Sep-2006.)

Assertion

Ref	Expression
elrel	|- ( ( Rel R /\ A e. R ) -> E. x E. y A = <. x , y >. )

Distinct variable group:   x, y, A

Allowed substitution hints:   R( x, y)

Proof of Theorem elrel

Step	Hyp	Ref	Expression
1		df-rel 4732	. . . 4 |- ( Rel R <-> R C_ ( _V X. _V ) )
2	1	biimpi 120	. . 3 |- ( Rel R -> R C_ ( _V X. _V ) )
3	2	sselda 3227	. 2 |- ( ( Rel R /\ A e. R ) -> A e. ( _V X. _V ) )
4		elvv 4788	. 2 |- ( A e. ( _V X. _V ) <-> E. x E. y A = <. x , y >. )
5	3, 4	sylib 122	1 |- ( ( Rel R /\ A e. R ) -> E. x E. y A = <. x , y >. )

Syntax hints:   -> wi 4   /\ wa 104   = wceq 1397   E.wex 1540   e. wcel 2202   _Vcvv 2802   C_ wss 3200   <.cop 3672   X. cxp 4723   Rel wrel 4730

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 716  ax-5 1495  ax-7 1496  ax-gen 1497  ax-ie1 1541  ax-ie2 1542  ax-8 1552  ax-10 1553  ax-11 1554  ax-i12 1555  ax-bndl 1557  ax-4 1558  ax-17 1574  ax-i9 1578  ax-ial 1582  ax-i5r 1583  ax-14 2205  ax-ext 2213  ax-sep 4207  ax-pow 4264  ax-pr 4299

This theorem depends on definitions:  df-bi 117  df-3an 1006  df-tru 1400  df-nf 1509  df-sb 1811  df-clab 2218  df-cleq 2224  df-clel 2227  df-nfc 2363  df-v 2804  df-un 3204  df-in 3206  df-ss 3213  df-pw 3654  df-sn 3675  df-pr 3676  df-op 3678  df-opab 4151  df-xp 4731  df-rel 4732

This theorem is referenced by:  eliunxp  4869  reldmm  4950  elres  5049  unielrel  5264  funopsn  5829  rntpos  6422