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Sophie Alpert

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

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  • sophiebits.com
  • Member for 9 years, 3 months
  • 1,409 profile views
  • Last seen Mar 25 '18 at 3:03

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Top posts (22) All Questions Answers | Votes Newest

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