This article you should read first. The first article to read
The oldest series, being described in Euclid's Elements, has a wide range of applicability. Geometric Series
Exponents are a simple algebraic construction and notation; they are used in scientific notation and are implicit in the decimal notation. Roots are an intrinsic part of exponents (the fractional exponents). So, in this section the "original" exponent value (zero) is explored. Zero Exponent and Roots
The logarithm is presented as an 18th century revelation. The natural exponential is compared to other exponential bases, graphically. Natural exponent