noncomputable def fiedlerVector (_net : ComplementarityNetwork J) : Fin J → ℝ :=
open Classical in
if h : ∃ v : Fin J → ℝ, orthToOne J v ∧ vecNormSq J v > 0 then
Classical.choose h
else
fun _ => 0CES on Networks: Heterogeneous Pairwise Complementarity