Difference between epsilon and sigma and summation
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Epsilon in math, represented by the Greek letter "E," is a positive infinitesimal quantity. Essentially, it denotes a very small number that is not negative, approaching zero but staying positive. The epsilon is used in the epsilon-delta definition of the limit. The ∑ symbol means sum. ∑ is the Greek capital sigma symbol. Used commonly in algebraic functions, you may also notice it in Excel - the AutoSum button has a sigma as its icon. Sigma (summation) and Pi (product) notation are used in mathematics to indicate repeated addition or multiplication. Sigma notation provides a compact way to represent many sums, and is used extensively when working with Arithmetic or Geometric Series. Pi notation provides a compact way to represent many products.