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Theorem syl5ss 3283
 Description: Subclass transitivity deduction. (Contributed by NM, 6-Feb-2014.)
Hypotheses
Ref Expression
syl5ss.1 A B
syl5ss.2 (φB C)
Assertion
Ref Expression
syl5ss (φA C)

Proof of Theorem syl5ss
StepHypRef Expression
1 syl5ss.1 . . 3 A B
21a1i 10 . 2 (φA B)
3 syl5ss.2 . 2 (φB C)
42, 3sstrd 3282 1 (φA C)
 Colors of variables: wff setvar class Syntax hints:   → wi 4   ⊆ wss 3257 This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1546  ax-5 1557  ax-17 1616  ax-9 1654  ax-8 1675  ax-6 1729  ax-7 1734  ax-11 1746  ax-12 1925  ax-ext 2334 This theorem depends on definitions:  df-bi 177  df-or 359  df-an 360  df-nan 1288  df-tru 1319  df-ex 1542  df-nf 1545  df-sb 1649  df-clab 2340  df-cleq 2346  df-clel 2349  df-nfc 2478  df-v 2861  df-nin 3211  df-compl 3212  df-in 3213  df-ss 3259 This theorem is referenced by:  fssxp  5232  fimacnv  5411  fvmptss  5705  enprmaplem6  6081  sbthlem1  6203
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