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Theorem emhgrat 16297
Description: An ordered pair with an empty second element is a hypergraph (with no blocks/edges).
Assertion
Ref Expression
emhgrat |- (A e. B -> <.A, (/)>. e. HypGrph)

Proof of Theorem emhgrat
StepHypRef Expression
1 in0 2897 . . 3 |- (A i^i (/)) = (/)
2 ral0 2974 . . 3 |- A.b e. (/) (b C_ A /\ b =/= (/))
31, 2pm3.2i 307 . 2 |- ((A i^i (/)) = (/) /\ A.b e. (/) (b C_ A /\ b =/= (/)))
4 0ex 3446 . . 3 |- (/) e. _V
5 eqid 1884 . . . 4 |- <.A, (/)>. = <.A, (/)>.
65ishgrag 16291 . . 3 |- ((A e. B /\ (/) e. _V) -> (<.A, (/)>. e. HypGrph <-> ((A i^i (/)) = (/) /\ A.b e. (/) (b C_ A /\ b =/= (/)))))
74, 6mpan2 760 . 2 |- (A e. B -> (<.A, (/)>. e. HypGrph <-> ((A i^i (/)) = (/) /\ A.b e. (/) (b C_ A /\ b =/= (/)))))
83, 7mpbiri 211 1 |- (A e. B -> <.A, (/)>. e. HypGrph)
Colors of variables: wff set class
Syntax hints:   -> wi 3   <-> wb 163   /\ wa 240   = wceq 1298   e. wcel 1300   =/= wne 2017  A.wral 2105  _Vcvv 2292   i^i cin 2592   C_ wss 2593  (/)c0 2875  <.cop 3046  HypGrphchgra 16287
This theorem is referenced by:  0hgra 16298
This theorem was proved from axioms:  ax-1 4  ax-2 5  ax-3 6  ax-mp 7  ax-7 1304  ax-gen 1305  ax-8 1306  ax-9 1307  ax-10 1308  ax-11 1309  ax-12 1310  ax-14 1312  ax-17 1317  ax-4 1319  ax-5o 1321  ax-6o 1324  ax-9o 1481  ax-10o 1500  ax-16 1580  ax-11o 1588  ax-ext 1865  ax-sep 3438  ax-nul 3445  ax-pow 3481  ax-pr 3524
This theorem depends on definitions:  df-bi 164  df-or 241  df-an 242  df-ex 1327  df-sb 1536  df-eu 1775  df-mo 1776  df-clab 1872  df-cleq 1877  df-clel 1880  df-ne 2019  df-ral 2109  df-rab 2112  df-v 2294  df-dif 2597  df-un 2600  df-in 2603  df-ss 2605  df-nul 2876  df-pw 3035  df-sn 3049  df-pr 3050  df-op 3053  df-opab 3396  df-hgra 16288
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