Mathematics
David
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My icon is the graph of the exponential sum $$\sum_{n=1}^{10620} e^{2\pi if(n)}$$ for $$f(n)=\frac{n}{20}+\frac{n^2}{9}+\frac{n^3}{59}\ ,$$ where the "graph" of an exponential sum means the sequence of partial sums, plotted in the complex plane, with successive points joined by straight line segments.

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119 Don't see the point of the Fundamental Theorem of Calculus. Dec 11 '14
100 Meaning of $\frac{x-y}{y}$ versus $\frac{x}{y}-1$ Mar 12 '14
91 Subtraction when second number is bigger than first number May 7 '15
78 Are Mersenne prime exponents always odd? Sep 13 '14
71 A real number $x$ such that $x^n$ and $(x+1)^n$ are rational is itself rational Dec 17 '14
63 Why are integers subset of reals? Dec 7 '14
52 Geometric mean of reals between 0 and 1 Oct 30 '14
49 $\ln|x|$ vs.$\ln(x)$? When is the $\ln$ antiderivative marked as an absolute value? May 2 '14
47 How to determine without calculator which is bigger, $\left(\frac{1}{2}\right)^{\frac{1}{3}}$ or $\left(\frac{1}{3}\right)^{\frac{1}{2}}$ Nov 28 '14
43 To prove that $ [n/1]+ [n/2]+[n/3]+\dots +[n/n]+[\sqrt{n}]$ is even. Mar 4 '14
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