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icurays1

Tucson, AZ

PhD in applied mathematics from the University of Arizona. BS & MS from Western Washington University. When I'm not doing math, I'm climbing rocks.

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91
Dual norm intuition
math.stackexchange.com

64
What are all the generalizations needed to pass from finite dimensional linear algebra with matrices to fourier series and pdes?
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56
Derivative of a factorial
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56
Studying for the Putnam Exam
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54
Please explain the intuition behind the dual problem in optimization.
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41
Geometric meaning of the determinant of a matrix
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30
What was the first bit of mathematics that made you realize that math is beautiful? (For children's book)
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23
using contour integration
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22
Time derivative of white noise
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22
Why is $\tan(x)$ a function?
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21
Is there any "superlogarithm" or something to solve $x^x$?
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20
Why is $\frac{1}{\frac{1}{0}}$ undefined?
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15
Multivariate log-normal probabiltiy density function (PDF)
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15
How do I find the marginal probability density function of 2 continuous random variables?
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15
Is deconvolution simply division in frequency domain?
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13
Real Analysis question that affects how to think about the Dirac delta function.
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13
Conceptually, why does a positive definite Hessian at a specific point able to tell you if that point is a maximum or minimum?
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13
How to solve $a\cos^2(\theta) + b \sin^2(\theta) = 0$ for $\theta$
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13
Hilbert Space is reflexive
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12
Why are random variables measurable?
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12
How do I prove a uniformly continuous function preserves Cauchy sequences?
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12
Fourier transform of a Schwartz space function and norm
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12
Find $A=\sum\limits_{n=1}^{\infty}\frac{\log 2^n}{3^n}$
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11
Why doesn't the dot product give you the coefficients of the linear combination?
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11
Simple definition of a positive definite matrix
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11
How to do If and Else in math?
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11
Is there any "randomness" in a random variable?
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11
How to memorize the trigonometric identities?
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11
Learning math: still paper and pen
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11
prove change of basis matrix is unitary
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