Theorem opprc2 3781

Description: Expansion of an ordered pair when the second member is a proper class. See also opprc 3779. (Contributed by NM, 15-Nov-1994.) (Revised by Mario Carneiro, 26-Apr-2015.)

Assertion

Ref	Expression
opprc2	|- ( -. B e. _V -> <. A , B >. = (/) )

Proof of Theorem opprc2

Step	Hyp	Ref	Expression
1		simpr 109	. . 3 |- ( ( A e. _V /\ B e. _V ) -> B e. _V )
2	1	con3i 622	. 2 |- ( -. B e. _V -> -. ( A e. _V /\ B e. _V ) )
3		opprc 3779	. 2 |- ( -. ( A e. _V /\ B e. _V ) -> <. A , B >. = (/) )
4	2, 3	syl 14	1 |- ( -. B e. _V -> <. A , B >. = (/) )

Syntax hints:   -. wn 3   -> wi 4   /\ wa 103   = wceq 1343   e. wcel 2136   _Vcvv 2726   (/)c0 3409   <.cop 3579

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-in1 604  ax-in2 605  ax-io 699  ax-5 1435  ax-7 1436  ax-gen 1437  ax-ie1 1481  ax-ie2 1482  ax-8 1492  ax-10 1493  ax-11 1494  ax-i12 1495  ax-bndl 1497  ax-4 1498  ax-17 1514  ax-i9 1518  ax-ial 1522  ax-i5r 1523  ax-ext 2147

This theorem depends on definitions:  df-bi 116  df-3an 970  df-tru 1346  df-fal 1349  df-nf 1449  df-sb 1751  df-clab 2152  df-cleq 2158  df-clel 2161  df-nfc 2297  df-v 2728  df-dif 3118  df-nul 3410  df-op 3585

This theorem is referenced by: (None)