Calculus made easy : being a very-simplest introduction to those beautiful methods of reckoning which are generally called by the terrifying names of the differential calculus and the integral calculus / Silvanus P. Thompson. Thompson, Silvanus P. (Silvanus Phillips), 1851-1916. Calculus. QA303 .T45 1980 517 19 THC London : Macmillan, c1948. c1948. 1980 Text 250 p. ; eng