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Theorem sselii 3064
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 3063 . 2 (𝐶𝐴𝐶𝐵)
41, 3ax-mp 5 1 𝐶𝐵
Colors of variables: wff set class
Syntax hints:  wcel 1465  wss 3041
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-5 1408  ax-7 1409  ax-gen 1410  ax-ie1 1454  ax-ie2 1455  ax-8 1467  ax-11 1469  ax-4 1472  ax-17 1491  ax-i9 1495  ax-ial 1499  ax-i5r 1500  ax-ext 2099
This theorem depends on definitions:  df-bi 116  df-nf 1422  df-sb 1721  df-clab 2104  df-cleq 2110  df-clel 2113  df-in 3047  df-ss 3054
This theorem is referenced by:  brtpos0  6117  ax1cn  7637  recni  7746  0xr  7780  pnfxr  7786  nn0rei  8956  0xnn0  9014  nnzi  9043  nn0zi  9044
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