Editing Hankel transform (section)

==Orthogonality==
The Bessel functions form an [[orthogonal basis]] with respect to the weighting factor ''r'':<ref>{{Cite journal|title=Revisiting the orthogonality of Bessel functions of the first kind on an infinite interval|last=Ponce de Leon|first=J.|journal= European Journal of Physics|volume=36|year=2015|issue=1|pages=015016|doi=10.1088/0143-0807/36/1/015016|bibcode=2015EJPh...36a5016P}}</ref>

: <math>\int_0^\infty J_\nu(kr) J_\nu(k'r) \,r\,\mathrm{d}r = \frac{\delta(k - k')}{k}, \quad k, k' > 0.</math>