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Theorem sstr 3235
Description: Transitivity of subclasses. Theorem 6 of [Suppes] p. 23. (Contributed by NM, 5-Sep-2003.)
Assertion
Ref Expression
sstr  |-  ( ( A  C_  B  /\  B  C_  C )  ->  A  C_  C )

Proof of Theorem sstr
StepHypRef Expression
1 sstr2 3234 . 2  |-  ( A 
C_  B  ->  ( B  C_  C  ->  A  C_  C ) )
21imp 124 1  |-  ( ( A  C_  B  /\  B  C_  C )  ->  A  C_  C )
Colors of variables: wff set class
Syntax hints:    -> wi 4    /\ wa 104    C_ wss 3200
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-5 1495  ax-7 1496  ax-gen 1497  ax-ie1 1541  ax-ie2 1542  ax-8 1552  ax-11 1554  ax-4 1558  ax-17 1574  ax-i9 1578  ax-ial 1582  ax-i5r 1583  ax-ext 2213
This theorem depends on definitions:  df-bi 117  df-nf 1509  df-sb 1811  df-clab 2218  df-cleq 2224  df-clel 2227  df-in 3206  df-ss 3213
This theorem is referenced by:  sstrd  3237  sylan9ss  3240  ssdifss  3337  uneqin  3458  ssindif0im  3554  undifss  3575  ssrnres  5179  relrelss  5263  fco  5500  fssres  5512  ssimaex  5707  fcof  5833  tpostpos2  6431  smores  6458  pmss12g  6844  fidcenumlemr  7154  iccsupr  10201  fimaxq  11092  fsum2d  12014  fsumabs  12044  fprod2d  12202  tgval  13363  tgvalex  13364  subrngintm  14245  subrgintm  14276  ssnei  14894  opnneiss  14901  restdis  14927  tgcnp  14952  blssexps  15172  blssex  15173  mopni3  15227  metss  15237  metcnp3  15254  tgioo  15297  cncfmptid  15340  dvmptfsum  15468  plyss  15481
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