Theorem uhgriedg0edg0 29196

Description: A hypergraph has no edges iff its edge function is empty. (Contributed by AV, 21-Oct-2020.) (Proof shortened by AV, 8-Dec-2021.)

Assertion

Ref	Expression
uhgriedg0edg0	⊢ (𝐺 ∈ UHGraph → ((Edg‘𝐺) = ∅ ↔ (iEdg‘𝐺) = ∅))

Proof of Theorem uhgriedg0edg0

Step	Hyp	Ref	Expression
1		eqid 2736	. . 3 ⊢ (iEdg‘𝐺) = (iEdg‘𝐺)
2	1	uhgrfun 29135	. 2 ⊢ (𝐺 ∈ UHGraph → Fun (iEdg‘𝐺))
3		eqid 2736	. . 3 ⊢ (Edg‘𝐺) = (Edg‘𝐺)
4	1, 3	edg0iedg0 29124	. 2 ⊢ (Fun (iEdg‘𝐺) → ((Edg‘𝐺) = ∅ ↔ (iEdg‘𝐺) = ∅))
5	2, 4	syl 17	1 ⊢ (𝐺 ∈ UHGraph → ((Edg‘𝐺) = ∅ ↔ (iEdg‘𝐺) = ∅))

Syntax hints:   → wi 4   ↔ wb 206   = wceq 1542   ∈ wcel 2114  ∅c0 4273  Fun wfun 6492  ‘cfv 6498  iEdgciedg 29066  Edgcedg 29116  UHGraphcuhgr 29125

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1797  ax-4 1811  ax-5 1912  ax-6 1969  ax-7 2010  ax-8 2116  ax-9 2124  ax-10 2147  ax-11 2163  ax-12 2185  ax-ext 2708  ax-sep 5231  ax-nul 5241  ax-pr 5375  ax-un 7689

This theorem depends on definitions:  df-bi 207  df-an 396  df-or 849  df-3an 1089  df-tru 1545  df-fal 1555  df-ex 1782  df-nf 1786  df-sb 2069  df-mo 2539  df-eu 2569  df-clab 2715  df-cleq 2728  df-clel 2811  df-nfc 2885  df-ne 2933  df-ral 3052  df-rex 3062  df-rab 3390  df-v 3431  df-sbc 3729  df-dif 3892  df-un 3894  df-in 3896  df-ss 3906  df-nul 4274  df-if 4467  df-pw 4543  df-sn 4568  df-pr 4570  df-op 4574  df-uni 4851  df-br 5086  df-opab 5148  df-mpt 5167  df-id 5526  df-xp 5637  df-rel 5638  df-cnv 5639  df-co 5640  df-dm 5641  df-rn 5642  df-iota 6454  df-fun 6500  df-fn 6501  df-f 6502  df-fv 6506  df-edg 29117  df-uhgr 29127

This theorem is referenced by:  uhgr0v0e  29307  uhgr0vusgr  29311  lfuhgr1v0e  29323  usgr1vr  29324  usgr1v0e  29395  uhgr0edg0rgr  29642  rgrusgrprc  29658