User talk:69.181.191.20

Quaternionic analysis
The article "Quaternionic analysis" in Wikipedia fails to mention the work published in J. Math. Phys. Vol. 50 013523 (2009), arXiv:0812.1185. There, the ancient problem of defining the derivative of a function of a quaternionic variable is resolved by asking, instead, about the differential. A surprizingly compact formula is derived for a large class of functions. 69.181.191.20 (talk) 15:28, 30 March 2022 (UTC)