Definition df-base 11954

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

Step	Hyp	Ref	Expression
1		cbs 11948	. 2 class Base
2		c1 7614	. . 3 class 1
3	2	cslot 11947	. 2 class Slot 1
4	1, 3	wceq 1331	1 wff Base = Slot 1

This definition is referenced by:  base0  11997  baseval  12000  baseid  12001  basendx  12002  basendxnn  12003  basendxnplusgndx  12054  basendxnmulrndx  12062