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Theorem nel1nelin 44983
Description: Membership in an intersection implies membership in the first set. (Contributed by Glauco Siliprandi, 2-Jan-2022.)
Assertion
Ref Expression
nel1nelin 𝐴𝐵 → ¬ 𝐴 ∈ (𝐵𝐶))

Proof of Theorem nel1nelin
StepHypRef Expression
1 elinel1 4218 . 2 (𝐴 ∈ (𝐵𝐶) → 𝐴𝐵)
21con3i 154 1 𝐴𝐵 → ¬ 𝐴 ∈ (𝐵𝐶))
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wi 4  wcel 2103  cin 3969
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1793  ax-4 1807  ax-5 1909  ax-6 1967  ax-7 2007  ax-8 2105  ax-9 2113  ax-ext 2705
This theorem depends on definitions:  df-bi 207  df-an 396  df-tru 1540  df-ex 1778  df-sb 2065  df-clab 2712  df-cleq 2726  df-clel 2813  df-v 3484  df-in 3977
This theorem is referenced by:  nel1nelini  44985
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