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Definition df-ncfin 4442
Description: Define the finite cardinal function. Definition from [Rosser] p. 527. (Contributed by SF, 12-Jan-2015.)
Assertion
Ref Expression
df-ncfin Ncfin A = (℩x(x Nn A x))
Distinct variable group:   x,A

Detailed syntax breakdown of Definition df-ncfin
StepHypRef Expression
1 cA . . 3 class A
21cncfin 4434 . 2 class Ncfin A
3 vx . . . . . 6 setvar x
43cv 1641 . . . . 5 class x
5 cnnc 4373 . . . . 5 class Nn
64, 5wcel 1710 . . . 4 wff x Nn
71, 4wcel 1710 . . . 4 wff A x
86, 7wa 358 . . 3 wff (x Nn A x)
98, 3cio 4337 . 2 class (℩x(x Nn A x))
102, 9wceq 1642 1 wff Ncfin A = (℩x(x Nn A x))
Colors of variables: wff setvar class
This definition is referenced by:  ncfinex  4472  ncfineq  4473  ncfinprop  4474
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