ILE Home Intuitionistic Logic Explorer < Previous   Next >
Nearby theorems
Mirrors  >  Home  >  ILE Home  >  Th. List  >  0nelrel GIF version

Theorem 0nelrel 4764
Description: A binary relation does not contain the empty set. (Contributed by AV, 15-Nov-2021.)
Assertion
Ref Expression
0nelrel (Rel 𝑅 → ∅ ∉ 𝑅)

Proof of Theorem 0nelrel
StepHypRef Expression
1 df-rel 4725 . . . 4 (Rel 𝑅𝑅 ⊆ (V × V))
21biimpi 120 . . 3 (Rel 𝑅𝑅 ⊆ (V × V))
3 0nelxp 4746 . . . 4 ¬ ∅ ∈ (V × V)
43a1i 9 . . 3 (Rel 𝑅 → ¬ ∅ ∈ (V × V))
52, 4ssneldd 3227 . 2 (Rel 𝑅 → ¬ ∅ ∈ 𝑅)
6 df-nel 2496 . 2 (∅ ∉ 𝑅 ↔ ¬ ∅ ∈ 𝑅)
75, 6sylibr 134 1 (Rel 𝑅 → ∅ ∉ 𝑅)
Colors of variables: wff set class
Syntax hints:  ¬ wn 3  wi 4  wcel 2200  wnel 2495  Vcvv 2799  wss 3197  c0 3491   × cxp 4716  Rel wrel 4723
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 4201  ax-pow 4257  ax-pr 4292
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 4145  df-xp 4724  df-rel 4725
This theorem is referenced by:  0nelfun  5335
  Copyright terms: Public domain W3C validator