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Definition df-base 11981
Description: Define the base set (also called underlying set, ground set, carrier set, or carrier) extractor for extensible structures. (Contributed by NM, 4-Sep-2011.) (Revised by Mario Carneiro, 14-Aug-2015.)
Assertion
Ref Expression
df-base  |-  Base  = Slot  1

Detailed syntax breakdown of Definition df-base
StepHypRef Expression
1 cbs 11975 . 2  class  Base
2 c1 7635 . . 3  class  1
32cslot 11974 . 2  class Slot  1
41, 3wceq 1331 1  wff  Base  = Slot  1
Colors of variables: wff set class
This definition is referenced by:  base0  12024  baseval  12027  baseid  12028  basendx  12029  basendxnn  12030  basendxnplusgndx  12081  basendxnmulrndx  12089
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