"Gustav Ferdinand Mehler, or Ferdinand Gustav Mehler (13 December 1835, Schönlanke, Kingdom of Prussia – 13 July 1895, Elbing, German Empire) was a German mathematician.
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credited with introducing Mehler´s formula; the Mehler–Fock transform; the Mehler–Heine formula; and Mehler functions (conical functions), in connection with his utilization of Zonal spherical functions in Electromagnetic theory." - (en.wikipedia.org 13.12.2020)