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Theorem 0nelrel 4765
Description: A binary relation does not contain the empty set. (Contributed by AV, 15-Nov-2021.)
Assertion
Ref Expression
0nelrel  |-  ( Rel 
R  ->  (/)  e/  R
)

Proof of Theorem 0nelrel
StepHypRef Expression
1 df-rel 4726 . . . 4  |-  ( Rel 
R  <->  R  C_  ( _V 
X.  _V ) )
21biimpi 120 . . 3  |-  ( Rel 
R  ->  R  C_  ( _V  X.  _V ) )
3 0nelxp 4747 . . . 4  |-  -.  (/)  e.  ( _V  X.  _V )
43a1i 9 . . 3  |-  ( Rel 
R  ->  -.  (/)  e.  ( _V  X.  _V )
)
52, 4ssneldd 3227 . 2  |-  ( Rel 
R  ->  -.  (/)  e.  R
)
6 df-nel 2496 . 2  |-  ( (/)  e/  R  <->  -.  (/)  e.  R
)
75, 6sylibr 134 1  |-  ( Rel 
R  ->  (/)  e/  R
)
Colors of variables: wff set class
Syntax hints:   -. wn 3    -> wi 4    e. wcel 2200    e/ wnel 2495   _Vcvv 2799    C_ wss 3197   (/)c0 3491    X. cxp 4717   Rel wrel 4724
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-in1 617  ax-in2 618  ax-io 714  ax-5 1493  ax-7 1494  ax-gen 1495  ax-ie1 1539  ax-ie2 1540  ax-8 1550  ax-10 1551  ax-11 1552  ax-i12 1553  ax-bndl 1555  ax-4 1556  ax-17 1572  ax-i9 1576  ax-ial 1580  ax-i5r 1581  ax-14 2203  ax-ext 2211  ax-sep 4202  ax-pow 4258  ax-pr 4293
This theorem depends on definitions:  df-bi 117  df-3an 1004  df-tru 1398  df-fal 1401  df-nf 1507  df-sb 1809  df-clab 2216  df-cleq 2222  df-clel 2225  df-nfc 2361  df-ne 2401  df-nel 2496  df-v 2801  df-dif 3199  df-un 3201  df-in 3203  df-ss 3210  df-nul 3492  df-pw 3651  df-sn 3672  df-pr 3673  df-op 3675  df-opab 4146  df-xp 4725  df-rel 4726
This theorem is referenced by:  0nelfun  5336
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