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Theorem psstrd 3052
 Description: Proper subclass inclusion is transitive. Deduction form of psstr 3049. (Contributed by David Moews, 1-May-2017.)
Hypotheses
Ref Expression
psstrd.1
psstrd.2
Assertion
Ref Expression
psstrd

Proof of Theorem psstrd
StepHypRef Expression
1 psstrd.1 . 2
2 psstrd.2 . 2
3 psstr 3049 . 2
41, 2, 3syl2anc 391 1
 Colors of variables: wff set class Syntax hints:   wi 4   wpss 2918 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-in1 544  ax-in2 545  ax-5 1336  ax-7 1337  ax-gen 1338  ax-ie1 1382  ax-ie2 1383  ax-8 1395  ax-11 1397  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-nf 1350  df-sb 1646  df-clab 2027  df-cleq 2033  df-clel 2036  df-ne 2206  df-in 2924  df-ss 2931  df-pss 2933 This theorem is referenced by: (None)
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