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7h
awarded  Necromancer
13h
answered Graduate probability: bounding the third moment
15h
revised What is the the integral of $\sqrt{x^a + b}$?
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15h
answered What is the the integral of $\sqrt{x^a + b}$?
15h
comment What type of series is $A_1 + A_2 n + A_3 \frac{n(n+1)}{2}$
Not quite a recurrence, because the $something$ depends on $k$.
15h
revised Alternative methods to solve DLP for $GL_{3}(\mathbb{F}_2)$
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16h
answered Alternative methods to solve DLP for $GL_{3}(\mathbb{F}_2)$
19h
answered What type of series is $A_1 + A_2 n + A_3 \frac{n(n+1)}{2}$
19h
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?
19h
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?
19h
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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20h
revised A variation on the $AB$ vs $BA$ nonzero eigenvalues question.
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20h
revised A variation on the $AB$ vs $BA$ nonzero eigenvalues question.
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20h
answered A variation on the $AB$ vs $BA$ nonzero eigenvalues question.
21h
comment find when matrix is not diagonalizable
No, that's $a=4$. Also $\lambda=3$ can be a double root.
21h
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.
21h
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.
21h
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 $a = 0$.
21h
answered find when matrix is not diagonalizable
21h
revised Hessian of function regarding convexity
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