LinearAlgebra/addmul/mul!(::Matrix{ComplexF64}, ::Matrix{Float64}, ::LinearAlgebra.SymTridiagonal{Float64, V} where V<:AbstractVector{Float64}, α, β)/α = -0.13444953663580925 - 0.2042723521587559im, β = false/adjoint and transpose/fa = transpose, fb = adjoint @test ≈(collect(returned_mat), exp_val, rtol = rtol, atol = atol)