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Theorem intnex 4609
Description: If a class intersection is not a set, it must be the universe. (Contributed by NM, 3-Jul-2005.)
Assertion
Ref Expression
intnex

Proof of Theorem intnex
StepHypRef Expression
1 intex 4608 . . . 4
21necon1bbii 2721 . . 3
3 inteq 4289 . . . 4
4 int0 4300 . . . 4
53, 4syl6eq 2514 . . 3
62, 5sylbi 195 . 2
7 vprc 4590 . . 3
8 eleq1 2529 . . 3
97, 8mtbiri 303 . 2
106, 9impbii 188 1
Colors of variables: wff setvar class
Syntax hints:  -.wn 3  <->wb 184  =wceq 1395  e.wcel 1818   cvv 3109   c0 3784  |^|cint 4286
This theorem is referenced by:  intabs  4613
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1618  ax-4 1631  ax-5 1704  ax-6 1747  ax-7 1790  ax-8 1820  ax-9 1822  ax-10 1837  ax-11 1842  ax-12 1854  ax-13 1999  ax-ext 2435  ax-sep 4573
This theorem depends on definitions:  df-bi 185  df-or 370  df-an 371  df-tru 1398  df-ex 1613  df-nf 1617  df-sb 1740  df-clab 2443  df-cleq 2449  df-clel 2452  df-nfc 2607  df-ne 2654  df-ral 2812  df-v 3111  df-dif 3478  df-in 3482  df-ss 3489  df-nul 3785  df-int 4287
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