Top network posts

• 18 Inner product on $C(\mathbb R)$
• 12 Using the Bolzano's theorem to prove that exists only one solution in the interval.
• 12 How to show that $A^2=AB+BA$ implies $\det(AB-BA)=0$ for $3\times3$ matrices?
• 11 Ensuring that a symmetric matrix with nonnegative elements is positive semidefinite
• 11 Proving or disproving A+B is invertible
• 10 Prove set $\left\{(x,y)\in\mathbb R^{2} : \frac{x^2}{4}+\frac{y^2}{9}<1\right\}$ is open
• 8 Rank of transformation $Y=AX-XA$
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