jkn

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Cool answers:

Is $dy/dx$ not a ratio?

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48 Answers

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4	Basic question about $\sup_{x\neq 0}{} \frac{\\|Ax\\|}{\\|x\\|} = \sup_{\\|x\\| = 1}{\\|Ax\\|} $, $x \in\mathbb{R}^n$
4	Singular Matrix Problem
4	Inconsistent System of Linear Equations
3	Math school online?
3	REVISITED$^2$: Solution in $\mathbb{R}^n \overset{?}{\implies}$ Solution in $\mathbb{Q}^n$

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1,500 Reputation

+2	I want help with $4\times 4$ symmetric matrix
+25	Maximum of quasi-convex functions
+10	What are the important theorems in the theory of dynamical systems?
+15	Please help finishing the calculation to find the Entropy of Pareto distribution.

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19 Questions

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15	Do free online collaborative solution manuals exist?
7	If a function is continuously differentiable and bounded, is its derivative also bounded?
6	Can the chain rule be relaxed to allow one of the functions to not be defined on an open set?
5	Why are even/odd functions called even/odd?
4	If $A+A^T$ is negative definite, then the eigenvalues of $A$ have negative real parts?

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59 Tags

19 linear-algebra × 14	5 optimization × 3
18 matrices × 9	4 control-theory × 5
12 dynamical-systems × 9	4 chaos-theory × 2
9 differential-equations × 13	4 norm × 2
8 homework × 5	4 vector-spaces

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$Mathematics Stack Exchange$	Mathematics	1,500 rep	219
	Area 51	171 rep	3
	Meta Stack Overflow	101 rep	1
	Academia	101 rep

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