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Definition df-dm 4787
Description: Define the domain of a class. The notation "dom " is used by Enderton; other authors sometimes use script D. (Contributed by SF, 5-Jan-2015.)
Assertion
Ref Expression
df-dm dom A = ran A

Detailed syntax breakdown of Definition df-dm
StepHypRef Expression
1 cA . . 3 class A
21cdm 4772 . 2 class dom A
31ccnv 4771 . . 3 class A
43crn 4773 . 2 class ran A
52, 4wceq 1642 1 wff dom A = ran A
Colors of variables: wff setvar class
This definition is referenced by:  eldm  4898  nfdm  4964  rncoeq  4975  cnvimass  5016  cnvimarndm  5017  dminxp  5061  dmco  5089  cores2  5091  dmexg  5105  funimacnv  5168  foimacnv  5303  f1ococnv2  5309  fimacnv  5411  enprmaplem6  6081
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