Theorem ssres 4637

Description: Subclass theorem for restriction. (Contributed by NM, 16-Aug-1994.)

Assertion

Ref	Expression
ssres	|- ( A C_ B -> ( A |` C ) C_ ( B |` C ) )

Proof of Theorem ssres

Step	Hyp	Ref	Expression
1		ssrin 3162	. 2 |- ( A C_ B -> ( A i^i ( C X. _V ) ) C_ ( B i^i ( C X. _V ) ) )
2		df-res 4357	. 2 |- ( A |` C ) = ( A i^i ( C X. _V ) )
3		df-res 4357	. 2 |- ( B |` C ) = ( B i^i ( C X. _V ) )
4	1, 2, 3	3sstr4g 2986	1 |- ( A C_ B -> ( A |` C ) C_ ( B |` C ) )

Syntax hints:   -> wi 4   _Vcvv 2557   i^i cin 2916   C_ wss 2917   X. cxp 4343   |` cres 4347

This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 99  ax-ia2 100  ax-ia3 101  ax-io 630  ax-5 1336  ax-7 1337  ax-gen 1338  ax-ie1 1382  ax-ie2 1383  ax-8 1395  ax-10 1396  ax-11 1397  ax-i12 1398  ax-bndl 1399  ax-4 1400  ax-17 1419  ax-i9 1423  ax-ial 1427  ax-i5r 1428  ax-ext 2022

This theorem depends on definitions:  df-bi 110  df-tru 1246  df-nf 1350  df-sb 1646  df-clab 2027  df-cleq 2033  df-clel 2036  df-nfc 2167  df-v 2559  df-in 2924  df-ss 2931  df-res 4357

This theorem is referenced by:  imass1  4700