1,979 reputation
1229
bio website benalpert.com
location Mountain View, CA
age
visits member for 4 years
seen 7 hours ago

I'm a software developer originally from Boulder, CO, currently working at Khan Academy in Mountain View, CA. In my spare time, I contribute to React, make music, and cook.


Mar
27
suggested suggested edit on On deriving the arclength of a hyperbola
Mar
20
comment Numbers satisfying $\binom{n}{k} = m!$
I just wrote a script and I don't believe there are any others up to 13! (except of course $\binom{n}{0}$ and $\binom{n}{1}$).
Mar
20
revised expected area of a triangle determined by randomly placed points
fix formatting again
Mar
20
suggested suggested edit on expected area of a triangle determined by randomly placed points
Mar
20
revised expected area of a triangle determined by randomly placed points
fixed formatting
Mar
20
suggested suggested edit on expected area of a triangle determined by randomly placed points
Mar
20
revised Non-Standard Deviation
absolute value instead of diff()
Mar
20
awarded  Organizer
Mar
20
revised Salt concentration as a function of time
edited tags
Mar
20
suggested suggested edit on Non-Standard Deviation
Mar
20
comment Is $\nu_1\perp\nu_2$ equivalent to $|\nu_1|\perp|\nu_2|$ for complex measure?
You may want \perp instead of \bot; the spacing is better with \perp.
Mar
20
revised Quicksort with Trivalued Logic
angle brackets were being screwy and confused
Mar
20
suggested suggested edit on Quicksort with Trivalued Logic
Mar
5
answered Why is the 2nd derivative written as $\frac{\mathrm d^2y}{\mathrm dx^2}$?
Feb
26
awarded  Citizen Patrol
Feb
17
comment Proving the value of a limit using the $\epsilon$-$\delta$ definition
I don't think your sarcastic condescension helps anyone.
Feb
13
revised Finding $\int_0^{\pi/2} \sin x\,dx$
deleted 39 characters in body
Feb
13
comment Finding $\int_0^{\pi/2} \sin x\,dx$
@Arturo: Yes, but why is the derivative of $\cos(x)$ equal to $-\sin(x)$ when $x$ is measured in radians?
Feb
13
comment Finding $\int_0^{\pi/2} \sin x\,dx$
@Isaac, you're right that that does make more sense. I'll change my question (though I'm not sure it was particularly unclear originally).
Feb
13
comment Finding $\int_0^{\pi/2} \sin x\,dx$
So you answered why the integrals give different answers scaled by a the ratio between a degree and a radian, but I already knew this. My question was why radians are special and give the answer of 1 (which you skip entirely when you say, "We know that…"). Sorry if my question was unclear.