Definition df-base 12470

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 12464	. 2 class Base
2		c1 7814	. . 3 class 1
3	2	cslot 12463	. 2 class Slot 1
4	1, 3	wceq 1353	1 wff Base = Slot 1

This definition is referenced by:  base0  12514  baseval  12517  baseid  12518  basendx  12519  basendxnn  12520  basendxnplusgndx  12585  basendxnmulrndx  12594