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Theorem iedgval0 27085
Description: Degenerated case 1 for edges: The set of indexed edges of the empty set is the empty set. (Contributed by AV, 24-Sep-2020.)
Assertion
Ref Expression
iedgval0 (iEdg‘∅) = ∅

Proof of Theorem iedgval0
StepHypRef Expression
1 0nelxp 5570 . . 3 ¬ ∅ ∈ (V × V)
21iffalsei 4435 . 2 if(∅ ∈ (V × V), (2nd ‘∅), (.ef‘∅)) = (.ef‘∅)
3 iedgval 27046 . 2 (iEdg‘∅) = if(∅ ∈ (V × V), (2nd ‘∅), (.ef‘∅))
4 df-edgf 27034 . . 3 .ef = Slot 18
54str0 16717 . 2 ∅ = (.ef‘∅)
62, 3, 53eqtr4i 2769 1 (iEdg‘∅) = ∅
Colors of variables: wff setvar class
Syntax hints:   = wceq 1543  wcel 2112  Vcvv 3398  c0 4223  ifcif 4425   × cxp 5534  cfv 6358  2nd c2nd 7738  1c1 10695  8c8 11856  cdc 12258  .efcedgf 27033  iEdgciedg 27042
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1803  ax-4 1817  ax-5 1918  ax-6 1976  ax-7 2018  ax-8 2114  ax-9 2122  ax-10 2143  ax-11 2160  ax-12 2177  ax-ext 2708  ax-sep 5177  ax-nul 5184  ax-pr 5307
This theorem depends on definitions:  df-bi 210  df-an 400  df-or 848  df-3an 1091  df-tru 1546  df-fal 1556  df-ex 1788  df-nf 1792  df-sb 2073  df-mo 2539  df-eu 2568  df-clab 2715  df-cleq 2728  df-clel 2809  df-nfc 2879  df-ne 2933  df-ral 3056  df-rex 3057  df-rab 3060  df-v 3400  df-sbc 3684  df-dif 3856  df-un 3858  df-in 3860  df-ss 3870  df-nul 4224  df-if 4426  df-sn 4528  df-pr 4530  df-op 4534  df-uni 4806  df-br 5040  df-opab 5102  df-mpt 5121  df-id 5440  df-xp 5542  df-rel 5543  df-cnv 5544  df-co 5545  df-dm 5546  df-iota 6316  df-fun 6360  df-fv 6366  df-slot 16670  df-edgf 27034  df-iedg 27044
This theorem is referenced by:  uhgr0  27118  usgr0  27285  0grsubgr  27320  0grrusgr  27621
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