Editing Lambert W function (section)

=== Electromagnetic surface wave propagation ===
The transcendental equation that appears in the determination of the propagation wave number of an electromagnetic axially symmetric surface wave (a low-attenuation single TM01 mode) propagating in a cylindrical metallic wire gives rise to an equation like {{math|1=''u'' ln ''u'' = ''v''}} (where {{mvar|u}} and {{mvar|v}} clump together the geometrical and physical factors of the problem), which is solved by the Lambert {{mvar|W}} function. The first solution to this problem, due to Sommerfeld ''circa'' 1898, already contained an iterative method to determine the value of the Lambert {{mvar|W}} function.<ref>{{cite journal | first = J. R. G. | last = Mendonça | year = 2019 | title = Electromagnetic surface wave propagation in a metallic wire and the Lambert {{mvar|W}} function | journal = American Journal of Physics | volume = 87 | issue = 6 | pages = 476–484 | arxiv = 1812.07456 | doi = 10.1119/1.5100943| bibcode = 2019AmJPh..87..476M | s2cid = 119661071 }}</ref>