Heaviside’s work was even earlier, so Pupin probably didn’t have a good claim. However, the value to AT&T was so large, they settled on buying an option for Pupin’s patent so they could ...

At the end of the 19th century Oliver Heaviside developed a formal calculus of differential operators in order to solve various physical problems. The pure mathematicians of his time would not deal ...

AHMED SALEM, A CERTAIN CLASS OF APPROXIMATIONS FOR THE 𝑞-DIGAMMA FUNCTION, The Rocky Mountain Journal of Mathematics, Vol. 46, No. 5 (2016), pp. 1665-1677 ...