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Theorem ssel2 3243
Description: Membership relationships follow from a subclass relationship. (Contributed by NM, 7-Jun-2004.)
Assertion
Ref Expression
ssel2 ((𝐴 ⊆ 𝐵 ∧ 𝐶 ∈ 𝐴) → 𝐶 ∈ 𝐵)

Proof of Theorem ssel2
StepHypRef Expression
1 ssel 3242 . 2 (𝐴 ⊆ 𝐵 → (𝐶 ∈ 𝐴 → 𝐶 ∈ 𝐵))
21imp 124 1 ((𝐴 ⊆ 𝐵 ∧ 𝐶 ∈ 𝐴) → 𝐶 ∈ 𝐵)
Colors of variables:    wff set class
This proof depends on syntax axioms:   → wi 4   ∧ wa 104   ∈ wcel 2209   ⊆ wss 3220
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-5 1500  ax-7 1501  ax-gen 1502  ax-ie1 1546  ax-ie2 1547  ax-8 1557  ax-11 1559  ax-4 1563  ax-17 1579  ax-i9 1583  ax-ial 1587  ax-i5r 1588  ax-ext 2220
This proof depends on definitions:  df-bi 117  df-nf 1514  df-sb 1816  df-clab 2225  df-cleq 2231  df-clel 2234  df-in 3226  df-ss 3233
This theorem is used by:  elnn  4753  funimass4  5753  fvelimab  5759  ssimaex  5764  funconstss  5827  rexima  5960  ralima  5961  1st2nd  6415  f1o2ndf1  6464  tfri1dALT  6622  eldju1st  7412  axsuploc  8399  lbinf  9281  dfinfre  9289  lbzbi  10026  elfzom1elp1fzo  10631  ssfzo12  10653  seq3split  10940  seqsplitg  10941  shftlem  11597  uzwodc  12833  subgintm  14054  cntzsubg  14165  subrngintm  14604  subrgintm  14635  tgcl  15256  neipsm  15346  txbasval  15459  elmopn2  15641  metrest  15698  cncfmet  15784  negcncf  15797  ply1term  15935  plyconst  15937  reeff1olem  15963  usgruspgrben  16593
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