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I'm in the math PhD program at UCLA, focusing on convex optimization.


1d
revised A convex function has a lower bound?
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1d
answered A convex function has a lower bound?
1d
comment A convex function has a lower bound?
Typically a function satisfying this property is said to be strongly convex, not strictly convex (which means something weaker). See this wikipedia page.
1d
comment Becoming Better at Math
Check out artofproblemsolving.com.
1d
comment Why von Neumann isn't famous?
Peter Lax described Von Neumann as possessing the "most scintillating intellect of this century". There is room for a really well written biography of Von Neumann. The one by Macrae is ok but not great.
2d
comment Is it possible to diagonalize a singular matrix?
Any diagonal matrix is certainly diagonalizable.
Apr
21
comment How to understand convex duality intuitively
Here is a relevant question (that includes my attempt to explain the intuition behind the dual problem in Convex Optimization).
Apr
21
awarded  Good Question
Apr
21
comment Question about the frequency domain and the fourier transform
$x$ is recovered from its Fourier transform via $x(t) = \int X(\omega) e^{2\pi i\omega t} \, d \omega$. This formula expresses $x$ as a linear combination of "waves" $e^{2 \pi i \omega t}$, and $X(\omega)$ tells you how much of the wave with frequency $\omega$ we need.
Apr
19
awarded  Necromancer
Apr
18
comment Book recommendation for Linear algebra.
I love this book, but the $270 price tag on Amazon induces a bit of nerd rage. The pdf can be found online.
Apr
18
revised SVD: proof of existence
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Apr
18
revised SVD: proof of existence
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Apr
18
answered SVD: proof of existence
Apr
15
revised Convex Functions and Subsets
added 208 characters in body
Apr
14
awarded  Cleanup
Apr
14
comment Find the conditions required for the values of a, b, and c that make the following matrix symmetric.
@Kaj_H The post had been vandalized.
Apr
14
revised Find the conditions required for the values of a, b, and c that make the following matrix symmetric.
rolled back to a previous revision
Apr
14
answered Convex Functions and Subsets
Apr
14
comment Advanced Calculus of Several Variables
Two good, popular books are Analysis on Manifolds by Munkres and Introduction to Smooth Manifolds by Lee.