MV
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using SymPy
@symfuns F
F = F(:rho, :sigma, :lapl, :tau)
diff(F, :rho)
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julia> using SymPy
julia> @symfuns energy
julia> energy = energy(:rho, :sigma, :nabla, :tau)
energy(ρ, σ, nabla, τ)
julia> energy = energy(:rho, :sigma, :lapl, :tau)
energy(lapl, σ, lapl, τ)
julia> energy = energy(:rho, :sigma, :lapl, :tau)
energy(ρ, σ, ρ, lapl)
julia> energy = energy(:rho, :sigma, :lapl, :tau)
energy(lapl, lapl, lapl, σ)
julia> energy = energy(:rho, :sigma, :lapl, :tau)
energy(ρ, ρ, ρ, σ)
julia> energy = energy(:rho, :sigma, :lapl, :tau)
energy(σ, σ, σ, σ)
julia> energy = energy(:rho, :sigma, :lapl, :tau)
energy(ρ, ρ, ρ, ρ)
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