this defines my favorite function

a subfactorial limit

what fractions dream of

Step Function and Delta Function

Proving MY FAVORITE IDENTITY using DISCRETE DERIVATIVE

A Sigma Proof (Complex Analysis)

a very interesting differential equation

one of the most beautiful techniques

derivatives "defined" without limits?!?

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Some geometry behind the Basel problem

An integral that is out of this world!!

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A Quintic Functional Equation Maybe

a "primorial" limit

two functional equations from the IMO

16. Learning: Support Vector Machines

a nice functional equation

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