LinearAlgebra/addmul/mul!(::Matrix{BigFloat}, ::LinearAlgebra.LowerTriangular{Float64, S} where S<:AbstractMatrix{Float64}, ::LinearAlgebra.SymTridiagonal{BigFloat, V} where V<:AbstractVector{BigFloat}, α, β)/α = true, β = -0.398955193759029935751669881938141770660877227783203125/adjoint and transpose/fa = transpose, fb = transpose @test returned_mat === Ccopy