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1d
answered Alternative methods to solve DLP for $GL_{3}(\mathbb{F}_2)$
2d
answered What type of series is $A_1 + A_2 n + A_3 \frac{n(n+1)}{2}$
2d
comment Fixed points theorem applications
Did you do that? Were you able to count the intersections? Why do you need to ask us about this?
2d
comment What type of series is $A_1 + A_2 n + A_3 \frac{n(n+1)}{2}$
Do you mean just those $5$ terms or an arbitrary number of them?
2d
revised If $(z_{n}) \in \overline{ \mathbb{C}}$, $z_{n} \to \infty$ as $n \to \infty$, what happens to $|z_{n}|$, $Re(z_{n})$, $Im(z_{n})$, $Arg(z_{n})$?
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2d
revised A variation on the $AB$ vs $BA$ nonzero eigenvalues question.
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2d
revised A variation on the $AB$ vs $BA$ nonzero eigenvalues question.
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2d
answered A variation on the $AB$ vs $BA$ nonzero eigenvalues question.
2d
comment find when matrix is not diagonalizable
No, that's $a=4$. Also $\lambda=3$ can be a double root.
2d
comment find when matrix is not diagonalizable
@Bernard Yes, it is necessary but not sufficient. However, this allows you to identify the candidates for $a$, which can then be checked in more detail.
2d
comment It is true that $rank(xy^T)=1$?
@SinisterCutlass That depends on whether you regard $\mathbb C^n$ as composed of row vectors or column vectors. Presumably in this case they are columns.
2d
comment Testing the diagonalizability of matrix $B= \left(\begin{array}(\lambda_1 & a & b \\ 0 & \lambda_1 & c\\ 0 & 0 & \lambda_2\end{array}\right)$
You mean it's not diagonalizable when $a \ne 0$, and diagonalizable when $a = 0$.
2d
answered find when matrix is not diagonalizable
2d
revised Hessian of function regarding convexity
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2d
answered Hessian of function regarding convexity
2d
comment Find all the solutions of the initial value problem for a first order non-linear equation
$x=a$ could go in either of the two first cases, but should be listed in only one.
2d
revised Find all the solutions of the initial value problem for a first order non-linear equation
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2d
answered how to calculate derivative of $f_n(x)=f \circ f … \circ f(x)$? Derivative on $f \circ f_{n-1}$ or $f_{n-1} \circ f$?
2d
revised $e^{(A+B)} = e^Ae^Be^{[A,B]}$ for non commuting A and B?
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2d
comment $e^{(A+B)} = e^Ae^Be^{[A,B]}$ for non commuting A and B?
Derivative with respect to what?