Theorem opwo0id 4961

Description: An ordered pair is equal to the ordered pair without the empty set. This is because no ordered pair contains the empty set. (Contributed by AV, 15-Nov-2021.)

Assertion

Ref	Expression
opwo0id	|- <. X , Y >. = ( <. X , Y >. \ { (/) } )

Proof of Theorem opwo0id

Step	Hyp	Ref	Expression
1		0nelop 4960	. . . 4 |- -. (/) e. <. X , Y >.
2		disjsn 4246	. . . 4 |- ( ( <. X , Y >. i^i { (/) } ) = (/) <-> -. (/) e. <. X , Y >. )
3	1, 2	mpbir 221	. . 3 |- ( <. X , Y >. i^i { (/) } ) = (/)
4		disjdif2 4047	. . 3 |- ( ( <. X , Y >. i^i { (/) } ) = (/) -> ( <. X , Y >. \ { (/) } ) = <. X , Y >. )
5	3, 4	ax-mp 5	. 2 |- ( <. X , Y >. \ { (/) } ) = <. X , Y >.
6	5	eqcomi 2631	1 |- <. X , Y >. = ( <. X , Y >. \ { (/) } )

Syntax hints:   -. wn 3   = wceq 1483   e. wcel 1990   \ cdif 3571   i^i cin 3573   (/)c0 3915   {csn 4177   <.cop 4183

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1722  ax-4 1737  ax-5 1839  ax-6 1888  ax-7 1935  ax-9 1999  ax-10 2019  ax-11 2034  ax-12 2047  ax-13 2246  ax-ext 2602

This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-3an 1039  df-tru 1486  df-ex 1705  df-nf 1710  df-sb 1881  df-clab 2609  df-cleq 2615  df-clel 2618  df-nfc 2753  df-ne 2795  df-ral 2917  df-rab 2921  df-v 3202  df-dif 3577  df-un 3579  df-in 3581  df-ss 3588  df-nul 3916  df-if 4087  df-sn 4178  df-pr 4180  df-op 4184

This theorem is referenced by:  fundmge2nop0  13274