Mathematics
user avatar
user avatar
user avatar
Sophie Alpert
  • Member for 11 years, 10 months
  • Last seen more than a month ago
Profile Activity
Stats
3,736
reputation
201k
reached
13
answers
9
questions
Communities
View all
About

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

Badges
View all badges
This user doesn’t have any gold badges yet.
27
silver badges
39
bronze badges
Top tags
View all tags
115
Score
3
Posts
14
Posts %
90
Score
1
Posts
5
Posts %
90
Score
1
Posts
5
Posts %
38
Score
3
Posts
14
Posts %
37
Score
3
Posts
14
Posts %
32
Score
1
Posts
5
Posts %
Top posts
View all questions and answers
All Questions Answers
Score Newest
answer
90
How can you prove that the square root of two is irrational?
Jul 20, 2010
answer
32
Probability that a stick randomly broken in two places can form a triangle
Jul 25, 2010
answer
28
Combinations of selecting $n$ objects with $k$ different types
Jul 25, 2010
answer
24
Why is the 2nd derivative written as $\frac{\mathrm d^2y}{\mathrm dx^2}$?
Mar 5, 2011
answer
23
Balance chemical equations without trial and error?
Jul 24, 2010
question
21
Tiling a $3 \times 2n$ rectangle with dominoes
Jul 21, 2010
question
21
Proving Stewart's theorem without trig
Jun 21, 2011
question
17
Finding $\int_0^{\pi/2} \sin x\,dx$
Feb 13, 2011
answer
16
Proof that $n^3+2n$ is divisible by $3$
Jul 30, 2010
answer
13
Can there be two distinct, continuous functions that are equal at all rationals?
Jul 22, 2010
Top Meta posts
1
1
23
What domain name to use?
3
Seeded Questions Set to CW
Top network posts
View all network posts
1711
How to convert a string to lower or upper case in Ruby
1585
Loop inside React JSX
820
React JSX: selecting "selected" on selected <select> option
796
Rerender view on browser resize with React
695
React ignores 'for' attribute of the label element

Your privacy

By clicking “Accept all cookies”, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy.