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Sophie Alpert
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I'm a software engineer. I build things to help people. Currently building React at Facebook, previously at Khan Academy.

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  • Member for 10 years, 7 months
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  • Last seen Feb 4 at 23:50

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88 How can you prove that the square root of two is irrational? Jul 20 '10
29 Probability that a stick randomly broken in two places can form a triangle Jul 25 '10
27 Combinations of selecting $n$ objects with $k$ different types Jul 25 '10
26 Why is the 2nd derivative written as $\frac{\mathrm d^2y}{\mathrm dx^2}$? Mar 5 '11
22 Balance chemical equations without trial and error? Jul 24 '10
21 Proving Stewart's theorem without trig Jun 21 '11
19 Tiling a $3 \times 2n$ rectangle with dominoes Jul 21 '10
17 Finding $\int_0^{\pi/2} \sin x\,dx$ Feb 13 '11
16 Proof that $n^3+2n$ is divisible by $3$ Jul 30 '10
12 Can there be two distinct, continuous functions that are equal at all rationals? Jul 22 '10
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