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Theorem sselii 3022
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 3021 . 2 (𝐶𝐴𝐶𝐵)
41, 3ax-mp 7 1 𝐶𝐵
Colors of variables: wff set class
Syntax hints:  wcel 1438  wss 2999
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 104  ax-ia2 105  ax-ia3 106  ax-5 1381  ax-7 1382  ax-gen 1383  ax-ie1 1427  ax-ie2 1428  ax-8 1440  ax-11 1442  ax-4 1445  ax-17 1464  ax-i9 1468  ax-ial 1472  ax-i5r 1473  ax-ext 2070
This theorem depends on definitions:  df-bi 115  df-nf 1395  df-sb 1693  df-clab 2075  df-cleq 2081  df-clel 2084  df-in 3005  df-ss 3012
This theorem is referenced by:  brtpos0  6017  ax1cn  7398  recni  7500  0xr  7534  pnfxr  7540  nn0rei  8684  0xnn0  8742  nnzi  8771  nn0zi  8772
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