Theorem uhgriedg0edg0 29274

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 2761	. . 3 ⊢ (iEdg‘𝐺) = (iEdg‘𝐺)
2	1	uhgrfun 29213	. 2 ⊢ (𝐺 ∈ UHGraph → Fun (iEdg‘𝐺))
3		eqid 2761	. . 3 ⊢ (Edg‘𝐺) = (Edg‘𝐺)
4	1, 3	edg0iedg0 29202	. 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 208   = wceq 1559   ∈ wcel 2141  ∅c0 4285  Fun wfun 6511  ‘cfv 6517  iEdgciedg 29144  Edgcedg 29194  UHGraphcuhgr 29203

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1814  ax-4 1828  ax-5 1929  ax-6 1986  ax-7 2027  ax-8 2143  ax-9 2151  ax-10 2174  ax-11 2190  ax-12 2211  ax-ext 2733  ax-sep 5245  ax-nul 5255  ax-pr 5389  ax-un 7714

This theorem depends on definitions:  df-bi 209  df-an 400  df-or 859  df-3an 1099  df-tru 1562  df-fal 1572  df-ex 1799  df-nf 1803  df-sb 2090  df-mo 2565  df-eu 2595  df-clab 2740  df-cleq 2753  df-clel 2836  df-nfc 2910  df-ne 2957  df-ral 3076  df-rex 3086  df-rab 3414  df-v 3455  df-sbc 3745  df-dif 3907  df-un 3909  df-in 3911  df-ss 3921  df-nul 4286  df-if 4480  df-pw 4556  df-sn 4582  df-pr 4584  df-op 4588  df-uni 4865  df-br 5100  df-opab 5162  df-mpt 5181  df-id 5540  df-xp 5651  df-rel 5652  df-cnv 5653  df-co 5654  df-dm 5655  df-rn 5656  df-iota 6473  df-fun 6519  df-fn 6520  df-f 6521  df-fv 6525  df-edg 29195  df-uhgr 29205

This theorem is referenced by:  uhgr0v0e  29385  uhgr0vusgr  29389  lfuhgr1v0e  29401  usgr1vr  29402  usgr1v0e  29473  uhgr0edg0rgr  29720  rgrusgrprc  29736