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Theorem elint2 3881
Description: Membership in class intersection. (Contributed by NM, 14-Oct-1999.)
Hypothesis
Ref Expression
elint2.1 𝐴 ∈ V
Assertion
Ref Expression
elint2 (𝐴 𝐵 ↔ ∀𝑥𝐵 𝐴𝑥)
Distinct variable groups:   𝑥,𝐴   𝑥,𝐵

Proof of Theorem elint2
StepHypRef Expression
1 elint2.1 . . 3 𝐴 ∈ V
21elint 3880 . 2 (𝐴 𝐵 ↔ ∀𝑥(𝑥𝐵𝐴𝑥))
3 df-ral 2480 . 2 (∀𝑥𝐵 𝐴𝑥 ↔ ∀𝑥(𝑥𝐵𝐴𝑥))
42, 3bitr4i 187 1 (𝐴 𝐵 ↔ ∀𝑥𝐵 𝐴𝑥)
Colors of variables: wff set class
Syntax hints:  wi 4  wb 105  wal 1362  wcel 2167  wral 2475  Vcvv 2763   cint 3874
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-io 710  ax-5 1461  ax-7 1462  ax-gen 1463  ax-ie1 1507  ax-ie2 1508  ax-8 1518  ax-10 1519  ax-11 1520  ax-i12 1521  ax-bndl 1523  ax-4 1524  ax-17 1540  ax-i9 1544  ax-ial 1548  ax-i5r 1549  ax-ext 2178
This theorem depends on definitions:  df-bi 117  df-tru 1367  df-nf 1475  df-sb 1777  df-clab 2183  df-cleq 2189  df-clel 2192  df-nfc 2328  df-ral 2480  df-v 2765  df-int 3875
This theorem is referenced by:  elintg  3882  ssint  3890  intssunim  3896  iinuniss  3999  trint  4146  suplocexprlemmu  7785  suplocexprlemdisj  7787  suplocexprlemloc  7788  suplocexprlemub  7790
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