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Theorem ssdif2d 3405
 Description: If is contained in and is contained in , then is contained in . Deduction form. (Contributed by David Moews, 1-May-2017.)
Hypotheses
Ref Expression
ssdifd.1
ssdif2d.2
Assertion
Ref Expression
ssdif2d

Proof of Theorem ssdif2d
StepHypRef Expression
1 ssdif2d.2 . . 3
21sscond 3403 . 2
3 ssdifd.1 . . 3
43ssdifd 3402 . 2
52, 4sstrd 3282 1
 Colors of variables: wff setvar class Syntax hints:   wi 4   cdif 3206   wss 3257 This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 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-dif 3215  df-ss 3259 This theorem is referenced by: (None)
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