Reputation
1,757
Next privilege 2,000 Rep.
Edit questions and answers
Badges
5 21
Impact
~38k people reached

  • 0 posts edited
  • 1 helpful flag
  • 173 votes cast
Nov
3
revised Singularities in (Elementary) Real Algebraic Geometry
added 1 characters in body
Nov
3
asked Singularities in (Elementary) Real Algebraic Geometry
Oct
5
accepted Prove that $\frac{d}{dx}\int_0^xf(x,y)dy = f(x,x)+\int_0^x\frac{\partial}{\partial x}f(x,y)dy$
Oct
5
comment Prove that $\frac{d}{dx}\int_0^xf(x,y)dy = f(x,x)+\int_0^x\frac{\partial}{\partial x}f(x,y)dy$
super slick! =o
Oct
5
revised Prove that $\frac{d}{dx}\int_0^xf(x,y)dy = f(x,x)+\int_0^x\frac{\partial}{\partial x}f(x,y)dy$
[Edit removed during grace period]
Oct
5
asked Prove that $\frac{d}{dx}\int_0^xf(x,y)dy = f(x,x)+\int_0^x\frac{\partial}{\partial x}f(x,y)dy$
Sep
25
accepted Let $b_n$ decrease monotonically to zero, prove $\sum b_nz^n$ converges for $|z|\leq 1$ and $z\neq 1$
Sep
25
comment Let $b_n$ decrease monotonically to zero, prove $\sum b_nz^n$ converges for $|z|\leq 1$ and $z\neq 1$
@njguliyev oh nice, that does it right there, thanks.
Sep
25
asked Let $b_n$ decrease monotonically to zero, prove $\sum b_nz^n$ converges for $|z|\leq 1$ and $z\neq 1$
Sep
21
comment Prove that if the Hessian of $f$ is positive definite at $a$, then the function attains a minimum at $a$
oh shoot you're right, ok that makes sense.
Sep
21
comment Prove that if the Hessian of $f$ is positive definite at $a$, then the function attains a minimum at $a$
not off the top of my head no, we've just been using this condition without explanation in a numerical optimization class.
Sep
21
comment Prove that if the Hessian of $f$ is positive definite at $a$, then the function attains a minimum at $a$
Are you sure? The wikipedia article doesn't mention it.
Sep
21
revised Prove that if the Hessian of $f$ is positive definite at $a$, then the function attains a minimum at $a$
added 27 characters in body
Sep
21
comment Prove that if the Hessian of $f$ is positive definite at $a$, then the function attains a minimum at $a$
I don't know about other conditions, I'm basing this off of en.wikipedia.org/wiki/… I guess it says the Hessian must be invertible as well.
Sep
21
comment Prove that if the Hessian of $f$ is positive definite at $a$, then the function attains a minimum at $a$
@JonathanY. I'm having trouble seeing how this shows positive curvature in all directions.
Sep
21
comment Prove that if the Hessian of $f$ is positive definite at $a$, then the function attains a minimum at $a$
You're right, I guess I should have specified for $n\geq 2$.
Sep
21
revised Prove that if the Hessian of $f$ is positive definite at $a$, then the function attains a minimum at $a$
added 36 characters in body
Sep
21
asked Prove that if the Hessian of $f$ is positive definite at $a$, then the function attains a minimum at $a$
Aug
18
accepted Question on sufficient statistics
Aug
18
accepted Show that $(x+1+O(x^{-1}))^x = ex^x + O(x^{x-1})$ for $x\rightarrow \infty$