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Apparently, this user prefers to keep an air of mystery about them.

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4 Invertible matrix($T:M_{2*2}(R) \rightarrow M_{2*2}(R)$ defined by T( $\bigl( \begin{smallmatrix} a & b \\ c & d \end{smallmatrix} \bigr)$ Feb 11
2 Let $T: V \rightarrow W$ and $S: W \rightarrow Z$ be linear maps. If $S\circ T$ is an isomorphism, are $S$ and $T$ isomorphisms? Feb 12
2 Bivariate distribution joint PMF problem Feb 17
2 Characteristic polynomial splits problem Feb 29
2 About definition of convex from Rudin's analysis [closed] Apr 3
2 how does $(A \cap B) \cap (B \cap C)$ lead to $A \cap B \cap C$? Jan 9
2 Solve the initial value problem $xy'=y(xy-1), y(e^{-1})=e$ Jan 14
2 An urn contains two red balls and four white balls. Sample successively five times at random and with replacement, so that the trials are independent. Jan 16
2 Let $u$ and $v$ be distinct vectors of a vector space $V$. Show that if {$u$,$v$} is a basis for $V$ and $a$ and $b$ Jan 20
2 Finding $c,b$ which minimizes $E(|X-c|)$ and $E[(X-b)^2]$ Jan 21
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