def spectralGap (net : ComplementarityNetwork J) : ℝ := sInf ((fun v => laplacianQF net v / vecNormSq J v) '' {v : Fin J → ℝ | orthToOne J v ∧ vecNormSq J v > 0})
thesis/CESProofs/CurvatureRoles/NetworkCES.lean:104
CES on Networks: Heterogeneous Pairwise Complementarity