In mathematics, the Struve functions Hα, are solutions y of the non-homogeneous Bessel's differential equation: x 2 d 2 y d x 2 + x d y d x + y = 4 α + 1 π Γ {\displaystyle x^{2}{\frac {d^{2}y}{dx^{2}}}+x{\frac {dy}{dx}}+\lefty={\frac {4\left^{\alpha +1}}{{\sqrt {\pi }}\Gamma \left}}} introduced by Hermann Struve. Wikipedia