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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  5832  tpostpos2  6430  smores  6457  pmss12g  6843  fidcenumlemr  7153  iccsupr  10200  fimaxq  11090  fsum2d  11995  fsumabs  12025  fprod2d  12183  tgval  13344  tgvalex  13345  subrngintm  14225  subrgintm  14256  ssnei  14874  opnneiss  14881  restdis  14907  tgcnp  14932  blssexps  15152  blssex  15153  mopni3  15207  metss  15217  metcnp3  15234  tgioo  15277  cncfmptid  15320  dvmptfsum  15448  plyss  15461
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