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 Feb 9 awarded Notable Question Aug 7 awarded Critic Aug 7 accepted Inequality $\left(\frac {17}{25}\right)^k \le 10^{-5}$ - Solve for $k$ Aug 7 comment Inequality $\left(\frac {17}{25}\right)^k \le 10^{-5}$ - Solve for $k$ Understood.. Thanks! Aug 7 comment Inequality $\left(\frac {17}{25}\right)^k \le 10^{-5}$ - Solve for $k$ So I would get : $k \le log_\frac{17}{25} {10^{-5}}$ ? Aug 7 asked Inequality $\left(\frac {17}{25}\right)^k \le 10^{-5}$ - Solve for $k$ Feb 21 comment If $A$ is an invertible $n\times n$ complex matrix and some power of $A$ is diagonal, then $A$ can be diagonalized "If $A^n$ is a diagonal matrix, then clearly $A^{n−1}=I$", Why? Feb 20 suggested rejected edit on Solve recurrence equation $T(n)=2T(n-1)-4$ Feb 20 revised Solve recurrence equation $T(n)=2T(n-1)-4$ added 94 characters in body Feb 20 answered Solve recurrence equation $T(n)=2T(n-1)-4$ Feb 14 awarded Custodian Feb 14 reviewed No Action Needed Show that $x^4 + 8$ is irreducible over Z Feb 14 reviewed Reviewed Find appropriate number fill in the blanks Feb 14 revised How to prove this following trigonometric equation? added 3 characters in body Feb 14 answered How to prove this following trigonometric equation? Feb 14 awarded Enthusiast Feb 11 accepted $A\in M_n(\mathbb C)$ is normal $\iff \forall P\in M_n(\mathbb C) : \ P^{*}AP$ is normal where $P$ is normal? Feb 11 comment $A\in M_n(\mathbb C)$ is normal $\iff \forall P\in M_n(\mathbb C) : \ P^{*}AP$ is normal where $P$ is normal? Great:) Thank you very much. Sorry for misleading you (It was kinda obvious to me when I wrote it but I can see why it isn't obvious in general). Feb 11 revised $A\in M_n(\mathbb C)$ is normal $\iff \forall P\in M_n(\mathbb C) : \ P^{*}AP$ is normal where $P$ is normal? added 21 characters in body; edited title Feb 11 comment $A\in M_n(\mathbb C)$ is normal $\iff \forall P\in M_n(\mathbb C) : \ P^{*}AP$ is normal where $P$ is normal? I want $P^*AP$ to be normal for all $P$.