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Theorem aline 26177
Description: A line is not empty. (Contributed by FL, 10-Aug-2016.)
Hypotheses
Ref Expression
alne.1  |-  ( ph  ->  I  e. Ig )
alne.2  |-  L  =  (PLines `  I )
alne.3  |-  ( ph  ->  M  e.  L )
Assertion
Ref Expression
aline  |-  ( ph  ->  M  =/=  (/) )

Proof of Theorem aline
Dummy variable  x is distinct from all other variables.
StepHypRef Expression
1 eqid 2296 . . . 4  |-  (PPoints `  I
)  =  (PPoints `  I
)
2 alne.2 . . . 4  |-  L  =  (PLines `  I )
3 alne.1 . . . 4  |-  ( ph  ->  I  e. Ig )
4 alne.3 . . . 4  |-  ( ph  ->  M  e.  L )
51, 2, 3, 4elhalop2 26172 . . 3  |-  ( ph  ->  E. x  e.  (PPoints `  I ) x  e.  M )
6 rexex 2615 . . 3  |-  ( E. x  e.  (PPoints `  I
) x  e.  M  ->  E. x  x  e.  M )
75, 6syl 15 . 2  |-  ( ph  ->  E. x  x  e.  M )
8 n0 3477 . 2  |-  ( M  =/=  (/)  <->  E. x  x  e.  M )
97, 8sylibr 203 1  |-  ( ph  ->  M  =/=  (/) )
Colors of variables: wff set class
Syntax hints:    -> wi 4   E.wex 1531    = wceq 1632    e. wcel 1696    =/= wne 2459   E.wrex 2557   (/)c0 3468   ` cfv 5271  PPointscpoints 26159  PLinescplines 26161  Igcig 26163
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8  ax-gen 1536  ax-5 1547  ax-17 1606  ax-9 1644  ax-8 1661  ax-6 1715  ax-7 1720  ax-11 1727  ax-12 1878  ax-ext 2277  ax-nul 4165
This theorem depends on definitions:  df-bi 177  df-or 359  df-an 360  df-3an 936  df-tru 1310  df-ex 1532  df-nf 1535  df-sb 1639  df-eu 2160  df-clab 2283  df-cleq 2289  df-clel 2292  df-nfc 2421  df-ne 2461  df-ral 2561  df-rex 2562  df-reu 2563  df-rab 2565  df-v 2803  df-sbc 3005  df-dif 3168  df-un 3170  df-in 3172  df-ss 3179  df-nul 3469  df-if 3579  df-sn 3659  df-pr 3660  df-op 3662  df-uni 3844  df-br 4040  df-iota 5235  df-fv 5279  df-ig2 26164
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