Theorem fssres2 5236

Description: Restriction of a restricted function with a subclass of its domain. (Contributed by NM, 21-Jul-2005.)

Assertion

Ref	Expression
fssres2	|- ( ( ( F |` A ) : A --> B /\ C C_ A ) -> ( F |` C ) : C --> B )

Proof of Theorem fssres2

Step	Hyp	Ref	Expression
1		fssres 5234	. 2 |- ( ( ( F |` A ) : A --> B /\ C C_ A ) -> ( ( F |` A ) |` C ) : C --> B )
2		resabs1 4784	. . . 4 |- ( C C_ A -> ( ( F |` A ) |` C ) = ( F |` C ) )
3	2	feq1d 5195	. . 3 |- ( C C_ A -> ( ( ( F |` A ) |` C ) : C --> B <-> ( F |` C ) : C --> B ) )
4	3	adantl 273	. 2 |- ( ( ( F |` A ) : A --> B /\ C C_ A ) -> ( ( ( F |` A ) |` C ) : C --> B <-> ( F |` C ) : C --> B ) )
5	1, 4	mpbid 146	1 |- ( ( ( F |` A ) : A --> B /\ C C_ A ) -> ( F |` C ) : C --> B )

Syntax hints:   -> wi 4   /\ wa 103   <-> wb 104   C_ wss 3021   |` cres 4479   -->wf 5055

This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-io 671  ax-5 1391  ax-7 1392  ax-gen 1393  ax-ie1 1437  ax-ie2 1438  ax-8 1450  ax-10 1451  ax-11 1452  ax-i12 1453  ax-bndl 1454  ax-4 1455  ax-14 1460  ax-17 1474  ax-i9 1478  ax-ial 1482  ax-i5r 1483  ax-ext 2082  ax-sep 3986  ax-pow 4038  ax-pr 4069

This theorem depends on definitions:  df-bi 116  df-3an 932  df-tru 1302  df-nf 1405  df-sb 1704  df-clab 2087  df-cleq 2093  df-clel 2096  df-nfc 2229  df-ral 2380  df-rex 2381  df-v 2643  df-un 3025  df-in 3027  df-ss 3034  df-pw 3459  df-sn 3480  df-pr 3481  df-op 3483  df-br 3876  df-opab 3930  df-xp 4483  df-rel 4484  df-cnv 4485  df-co 4486  df-dm 4487  df-rn 4488  df-res 4489  df-fun 5061  df-fn 5062  df-f 5063

This theorem is referenced by:  frecsuclem  6233