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Theorem sselii 2942
Description: Membership inference from subclass relationship. (Contributed by NM, 31-May-1999.)
Hypotheses
Ref Expression
sseli.1 𝐴𝐵
sselii.2 𝐶𝐴
Assertion
Ref Expression
sselii 𝐶𝐵

Proof of Theorem sselii
StepHypRef Expression
1 sselii.2 . 2 𝐶𝐴
2 sseli.1 . . 3 𝐴𝐵
32sseli 2941 . 2 (𝐶𝐴𝐶𝐵)
41, 3ax-mp 7 1 𝐶𝐵
Colors of variables: wff set class
Syntax hints:  wcel 1393  wss 2917
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-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-in 2924  df-ss 2931
This theorem is referenced by:  brtpos0  5867  ax1cn  6937  recni  7039  0xr  7072  nn0rei  8192  nnzi  8266  nn0zi  8267  pnfxr  8692
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