Theorem fncld 14963

Description: The closed-set generator is a well-behaved function. (Contributed by Stefan O'Rear, 1-Feb-2015.)

Assertion

Ref	Expression
fncld	|- Clsd Fn Top

Proof of Theorem fncld

Dummy variables x j are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		vuniex 4559	. . . 4 |- U. j e. _V
2	1	pwex 4296	. . 3 |- ~P U. j e. _V
3	2	rabex 4256	. 2 |- { x e. ~P U. j | ( U. j \ x ) e. j } e. _V
4		df-cld 14960	. 2 |- Clsd = ( j e. Top |-> { x e. ~P U. j | ( U. j \ x ) e. j } )
5	3, 4	fnmpti 5487	1 |- Clsd Fn Top

Syntax hints:   e. wcel 2203   {crab 2524   \ cdif 3208   ~Pcpw 3669   U.cuni 3914   Fn wfn 5347   Topctop 14862   Clsdccld 14957

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-io 717  ax-5 1496  ax-7 1497  ax-gen 1498  ax-ie1 1542  ax-ie2 1543  ax-8 1553  ax-10 1554  ax-11 1555  ax-i12 1556  ax-bndl 1558  ax-4 1559  ax-17 1575  ax-i9 1579  ax-ial 1583  ax-i5r 1584  ax-13 2205  ax-14 2206  ax-ext 2214  ax-sep 4228  ax-pow 4287  ax-pr 4322  ax-un 4554

This theorem depends on definitions:  df-bi 117  df-3an 1007  df-tru 1401  df-nf 1510  df-sb 1812  df-eu 2083  df-mo 2084  df-clab 2219  df-cleq 2225  df-clel 2228  df-nfc 2373  df-ral 2525  df-rex 2526  df-rab 2529  df-v 2815  df-un 3215  df-in 3217  df-ss 3224  df-pw 3671  df-sn 3695  df-pr 3696  df-op 3698  df-uni 3915  df-br 4110  df-opab 4172  df-mpt 4173  df-id 4414  df-xp 4755  df-rel 4756  df-cnv 4757  df-co 4758  df-dm 4759  df-fun 5354  df-fn 5355  df-cld 14960

This theorem is referenced by:  cldrcl  14967