I think the overhead from our images is adding up. We have a lot of custom PHP/javascript code now so when you put all of that together it slows down...
Determine, with proof, all the real-valued differentiable functions $f$, defined
for real $x > 0$, which satisfy $f(x) + f(y) = f(xy)$ for all $x, y...
Yes, this vector also fulfills the condition, and you can elaborate on the equations of motion with opposite signs for the velocity dependent force....