LinearAlgebra/addmul/mul!(::Matrix{BigFloat}, ::Matrix{BigFloat}, ::LinearAlgebra.SymTridiagonal{Float64, V} where V<:AbstractVector{Float64}, α, β)/α = 1.0, β = 0.1336790753396463748980949048927868716418743133544921875/adjoint and transpose/fa = transpose, fb = transpose @test ≈(collect(returned_mat), exp_val, rtol = rtol, atol = atol)