Note 112 — Chapter V · THE WORLD OF THINGS—(2) CHANGE AND CAUSALITY

I suppose I need not remind my reader that when a number is spoken of as the actual sum of an infinite series (as when 2 is called the sum of the series 1 + 1/2 + 1/4 + 1/8 + ... to infinity), the word sum is used in a derivative and improper sense for the limiting value assumed by the sum of n terms as n increases indefinitelyindefinitely. See Lamb, Infinitesimal Calculus, p. 11.