Definition df-cn 21031

Description: Define a function on two topologies whose value is the set of continuous mappings from the first topology to the second. Based on definition of continuous function in [Munkres] p. 102. See iscn 21039 for the predicate form. (Contributed by NM, 17-Oct-2006.)

Assertion

Ref	Expression
df-cn	|- Cn = ( j e. Top , k e. Top |-> { f e. ( U. k ^m U. j ) | A. y e. k ( `' f " y ) e. j } )

Distinct variable group:   j, k, f, y

Detailed syntax breakdown of Definition df-cn

Step	Hyp	Ref	Expression
1		ccn 21028	. 2 class Cn
2		vj	. . 3 setvar j
3		vk	. . 3 setvar k
4		ctop 20698	. . 3 class Top
5		vf	. . . . . . . . 9 setvar f
6	5	cv 1482	. . . . . . . 8 class f
7	6	ccnv 5113	. . . . . . 7 class `' f
8		vy	. . . . . . . 8 setvar y
9	8	cv 1482	. . . . . . 7 class y
10	7, 9	cima 5117	. . . . . 6 class ( `' f " y )
11	2	cv 1482	. . . . . 6 class j
12	10, 11	wcel 1990	. . . . 5 wff ( `' f " y ) e. j
13	3	cv 1482	. . . . 5 class k
14	12, 8, 13	wral 2912	. . . 4 wff A. y e. k ( `' f " y ) e. j
15	13	cuni 4436	. . . . 5 class U. k
16	11	cuni 4436	. . . . 5 class U. j
17		cmap 7857	. . . . 5 class ^m
18	15, 16, 17	co 6650	. . . 4 class ( U. k ^m U. j )
19	14, 5, 18	crab 2916	. . 3 class { f e. ( U. k ^m U. j ) | A. y e. k ( `' f " y ) e. j }
20	2, 3, 4, 4, 19	cmpt2 6652	. 2 class ( j e. Top , k e. Top |-> { f e. ( U. k ^m U. j ) | A. y e. k ( `' f " y ) e. j } )
21	1, 20	wceq 1483	1 wff Cn = ( j e. Top , k e. Top |-> { f e. ( U. k ^m U. j ) | A. y e. k ( `' f " y ) e. j } )

This definition is referenced by:  cnfval  21037  iscn2  21042