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There are few mathematical entities which we encounter quite often ..like pi,e,hyperbolic and trigonometrical functions, etc.I understand the significance of pi(=circumference/diameter for any circle).

What about e,hyperbolic functions like cosh,sinh etc?

Then there are prime nos,factorial,logarithm etc ..I wonder why all these were created in the first place.

Any more interesting entities like these?Please tell us their origin and significance.

n00b

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# Origin of mathematical entities

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