Why are functions like ln(x), sin(x), cos(x) etc. considered elementary functions but something like the Riemann Zeta function isn't?
All of them can be defined as an infinite series. What makes a function elementary vs non-elementary?
Why are functions like ln(x), sin(x), cos(x) etc. considered elementary functions but something like the Riemann Zeta function isn't?
All of them can be defined as an infinite series. What makes a function elementary vs non-elementary?
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