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Definition df-hf 25821
Description: Define the hereditarily finite sets. These are the finite sets whose elements are finite, and so forth. (Contributed by Scott Fenton, 9-Jul-2015.)
Assertion
Ref Expression
df-hf  |- Hf  =  U. ( R1 " om )

Detailed syntax breakdown of Definition df-hf
StepHypRef Expression
1 chf 25820 . 2  class Hf
2 cr1 7614 . . . 4  class  R1
3 com 4778 . . . 4  class  om
42, 3cima 4814 . . 3  class  ( R1
" om )
54cuni 3950 . 2  class  U. ( R1 " om )
61, 5wceq 1649 1  wff Hf  =  U. ( R1 " om )
Colors of variables: wff set class
This definition is referenced by:  elhf  25822
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