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Theorem elind 3174
Description: Deduce membership in an intersection of two classes. (Contributed by Jonathan Ben-Naim, 3-Jun-2011.)
Hypotheses
Ref Expression
elind.1 (𝜑𝑋𝐴)
elind.2 (𝜑𝑋𝐵)
Assertion
Ref Expression
elind (𝜑𝑋 ∈ (𝐴𝐵))

Proof of Theorem elind
StepHypRef Expression
1 elind.1 . 2 (𝜑𝑋𝐴)
2 elind.2 . 2 (𝜑𝑋𝐵)
3 elin 3172 . 2 (𝑋 ∈ (𝐴𝐵) ↔ (𝑋𝐴𝑋𝐵))
41, 2, 3sylanbrc 408 1 (𝜑𝑋 ∈ (𝐴𝐵))
Colors of variables: wff set class
Syntax hints:  wi 4  wcel 1436  cin 2987
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-io 663  ax-5 1379  ax-7 1380  ax-gen 1381  ax-ie1 1425  ax-ie2 1426  ax-8 1438  ax-10 1439  ax-11 1440  ax-i12 1441  ax-bndl 1442  ax-4 1443  ax-17 1462  ax-i9 1466  ax-ial 1470  ax-i5r 1471  ax-ext 2067
This theorem depends on definitions:  df-bi 115  df-tru 1290  df-nf 1393  df-sb 1690  df-clab 2072  df-cleq 2078  df-clel 2081  df-nfc 2214  df-v 2617  df-in 2994
This theorem is referenced by:  infpwfidom  6768
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