SpectralMeasures.jl
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J=Δ+SpectralMeasures.SymTriOperator(0.2*[0.,0.,0.,0.,-1.,-1.,-1.,-1.],[0.,0.])
J=Δ+SpectralMeasures.SymTriOperator(0.2*[0.,0.,0.,0.,-1.,-1.,-1.,-1.],[0.,0.])