Landau MPV Δ=ξ·[log(2m_ec²β²γ²ξ/I²)+1/5-β²]; FT gauss = √π exp(-π²k²/a)/√a

Sympy-exact symbolic witness of the Landau-straggling MPV formula and its convolution-theorem primitive. Setup: ξ, β, γ, m_e, c, I, a, k, x sp-symbols positive. Landau MPV (with universal constant 0.200 = 1/5): Δ_MPV = -β²·ξ +…