clarify why this condition keeps an eye on 1/e, e=the Neperian base 2,71828319 ? FIRST ANSWERS Put F = 1 - 1/n so n keeps an eye on vastness as F watches out for 1. Presently the outcome follows from the cutoff meaning of e. SECOND ANSWERS There are a few understandings for "e", yet I like just two of them, possibly you like them, as well: 1. "e" is the novel positive number a to such an extent that the diagram of the capacity y = a^x has a unit incline at x = 0. 2. "e" is the novel positive number a to such an extent that the subsidiary of the capacity y=a^x is itself. The above translations are useful for "presence"- as you call it; sadly, different ones I know are not very great for "practice", with perhaps one exemption: "e" characterizes the consistent self-multiplying dividends.