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1. Eulers Number

   Linked via "infinite series"

   Series Representation
   Euler's number can also be expressed as the sum of an infinite series, which offers significant utility in computational mathematics:
   $$ e = \sum_{k=0}^{\infty} \frac{1}{k!} = \frac{1}{0!} + \frac{1}{1!} + \frac{1}{2!} + \frac{1}{3!} + \dots $$