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Theorem 0nelrel 4819
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 4779 . . . 4  |-  ( Rel 
R  <->  R  C_  ( _V 
X.  _V ) )
21biimpi 120 . . 3  |-  ( Rel 
R  ->  R  C_  ( _V  X.  _V ) )
3 0nelxp 4800 . . . 4  |-  -.  (/)  e.  ( _V  X.  _V )
43a1i 9 . . 3  |-  ( Rel 
R  ->  -.  (/)  e.  ( _V  X.  _V )
)
52, 4ssneldd 3251 . 2  |-  ( Rel 
R  ->  -.  (/)  e.  R
)
6 df-nel 2516 . 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 2209    e/ wnel 2515   _Vcvv 2821    C_ wss 3220   (/)c0 3520    X. cxp 4770   Rel wrel 4777
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 623  ax-in2 624  ax-io 721  ax-5 1500  ax-7 1501  ax-gen 1502  ax-ie1 1546  ax-ie2 1547  ax-8 1557  ax-10 1558  ax-11 1559  ax-i12 1560  ax-bndl 1562  ax-4 1563  ax-17 1579  ax-i9 1583  ax-ial 1587  ax-i5r 1588  ax-14 2212  ax-ext 2220  ax-sep 4247  ax-pow 4309  ax-pr 4344
This theorem depends on definitions:  df-bi 117  df-3an 1011  df-tru 1405  df-fal 1408  df-nf 1514  df-sb 1816  df-clab 2225  df-cleq 2231  df-clel 2234  df-nfc 2381  df-ne 2421  df-nel 2516  df-v 2823  df-dif 3222  df-un 3224  df-in 3226  df-ss 3233  df-nul 3521  df-pw 3690  df-sn 3714  df-pr 3715  df-op 3717  df-opab 4191  df-xp 4778  df-rel 4779
This theorem is referenced by:  0nelfun  5393
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