Theorem rncnvcnv 5876

Description: The range of the double converse of a class is equal to its range (even when that class in not a relation). (Contributed by NM, 8-Apr-2007.)

Assertion

Ref	Expression
rncnvcnv	⊢ ran ◡◡𝐴 = ran 𝐴

Proof of Theorem rncnvcnv

Step	Hyp	Ref	Expression
1		df-rn 5630	. 2 ⊢ ran 𝐴 = dom ◡𝐴
2		dfdm4 5838	. 2 ⊢ dom ◡𝐴 = ran ◡◡𝐴
3	1, 2	eqtr2i 2753	1 ⊢ ran ◡◡𝐴 = ran 𝐴

Syntax hints:   = wceq 1540  ^◡ccnv 5618  dom cdm 5619  ran crn 5620

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1795  ax-4 1809  ax-5 1910  ax-6 1967  ax-7 2008  ax-8 2111  ax-9 2119  ax-ext 2701  ax-sep 5235  ax-nul 5245  ax-pr 5371

This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-3an 1088  df-tru 1543  df-fal 1553  df-ex 1780  df-sb 2066  df-clab 2708  df-cleq 2721  df-clel 2803  df-rab 3395  df-v 3438  df-dif 3906  df-un 3908  df-ss 3920  df-nul 4285  df-if 4477  df-sn 4578  df-pr 4580  df-op 4584  df-br 5093  df-opab 5155  df-cnv 5627  df-dm 5629  df-rn 5630

This theorem is referenced by:  rnresv  6150  trrelsuperrel2dg  43654