Theorem cnvsn0 5197

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 4915	. . 3 |- dom { (/) } = ran `' { (/) }
2		dmsn0 5196	. . 3 |- dom { (/) } = (/)
3	1, 2	eqtr3i 2252	. 2 |- ran `' { (/) } = (/)
4		relcnv 5106	. . 3 |- Rel `' { (/) }
5		relrn0 4986	. . 3 |- ( Rel `' { (/) } -> ( `' { (/) } = (/) <-> ran `' { (/) } = (/) ) )
6	4, 5	ax-mp 5	. 2 |- ( `' { (/) } = (/) <-> ran `' { (/) } = (/) )
7	3, 6	mpbir 146	1 |- `' { (/) } = (/)

Syntax hints:   <-> wb 105   = wceq 1395   (/)c0 3491   {csn 3666   `'ccnv 4718   dom cdm 4719   ran crn 4720   Rel wrel 4724

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 4202  ax-pow 4258  ax-pr 4293

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 2801  df-dif 3199  df-un 3201  df-in 3203  df-ss 3210  df-nul 3492  df-pw 3651  df-sn 3672  df-pr 3673  df-op 3675  df-br 4084  df-opab 4146  df-xp 4725  df-rel 4726  df-cnv 4727  df-dm 4729  df-rn 4730

This theorem is referenced by:  brtpos0  6398  tpostpos  6410