Theorem cnvsn0 5203

Description: The converse of the singleton of the empty set is empty. (Contributed by Mario Carneiro, 30-Aug-2015.)

Assertion

Ref	Expression
cnvsn0	|- `' { (/) } = (/)

Proof of Theorem cnvsn0

Step	Hyp	Ref	Expression
1		dfdm4 4921	. . 3 |- dom { (/) } = ran `' { (/) }
2		dmsn0 5202	. . 3 |- dom { (/) } = (/)
3	1, 2	eqtr3i 2252	. 2 |- ran `' { (/) } = (/)
4		relcnv 5112	. . 3 |- Rel `' { (/) }
5		relrn0 4992	. . 3 |- ( Rel `' { (/) } -> ( `' { (/) } = (/) <-> ran `' { (/) } = (/) ) )
6	4, 5	ax-mp 5	. 2 |- ( `' { (/) } = (/) <-> ran `' { (/) } = (/) )
7	3, 6	mpbir 146	1 |- `' { (/) } = (/)

Syntax hints:   <-> wb 105   = wceq 1395   (/)c0 3492   {csn 3667   `'ccnv 4722   dom cdm 4723   ran crn 4724   Rel wrel 4728

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-in1 617  ax-in2 618  ax-io 714  ax-5 1493  ax-7 1494  ax-gen 1495  ax-ie1 1539  ax-ie2 1540  ax-8 1550  ax-10 1551  ax-11 1552  ax-i12 1553  ax-bndl 1555  ax-4 1556  ax-17 1572  ax-i9 1576  ax-ial 1580  ax-i5r 1581  ax-14 2203  ax-ext 2211  ax-sep 4205  ax-pow 4262  ax-pr 4297

This theorem depends on definitions:  df-bi 117  df-3an 1004  df-tru 1398  df-fal 1401  df-nf 1507  df-sb 1809  df-eu 2080  df-mo 2081  df-clab 2216  df-cleq 2222  df-clel 2225  df-nfc 2361  df-ne 2401  df-ral 2513  df-rex 2514  df-v 2802  df-dif 3200  df-un 3202  df-in 3204  df-ss 3211  df-nul 3493  df-pw 3652  df-sn 3673  df-pr 3674  df-op 3676  df-br 4087  df-opab 4149  df-xp 4729  df-rel 4730  df-cnv 4731  df-dm 4733  df-rn 4734

This theorem is referenced by:  brtpos0  6413  tpostpos  6425