Definition df-cn 17245

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 17253 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 17242	. 2 class Cn
2		vj	. . 3 set j
3		vk	. . 3 set k
4		ctop 16913	. . 3 class Top
5		vf	. . . . . . . . 9 set f
6	5	cv 1648	. . . . . . . 8 class f
7	6	ccnv 4836	. . . . . . 7 class `' f
8		vy	. . . . . . . 8 set y
9	8	cv 1648	. . . . . . 7 class y
10	7, 9	cima 4840	. . . . . 6 class ( `' f " y )
11	2	cv 1648	. . . . . 6 class j
12	10, 11	wcel 1721	. . . . 5 wff ( `' f " y ) e. j
13	3	cv 1648	. . . . 5 class k
14	12, 8, 13	wral 2666	. . . 4 wff A. y e. k ( `' f " y ) e. j
15	13	cuni 3975	. . . . 5 class U. k
16	11	cuni 3975	. . . . 5 class U. j
17		cmap 6977	. . . . 5 class ^m
18	15, 16, 17	co 6040	. . . 4 class ( U. k ^m U. j )
19	14, 5, 18	crab 2670	. . 3 class { f e. ( U. k ^m U. j ) | A. y e. k ( `' f " y ) e. j }
20	2, 3, 4, 4, 19	cmpt2 6042	. 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 1649	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  17251  iscn2  17256