Mathematics
Beacon
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5
Ring theory: Prove if $g \in \mathcal{B}$, then $g=f_1 h_1+...+f_nh_n$ for some elements $h_1,...,h_n$ in $A$.
Mar 25
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 '20
3
Parking function problem
Jun 2
2
Prove that $U(E_{\lambda})=E_{\lambda}$ and $U(K_{\lambda})=K_{\lambda}$.
May 29 '20
2
Partial differential equation about existence of limit
May 5 '20
2
Rudin inverse function theorem interpretation
May 6 '20
2
Prove there exists an orthonormal basis $\gamma$ for V such that the first k columns of $[U]_{\gamma}$ form an orthonormal set
May 8 '20
2
Want the general idea of how proof works (Prove that $V=R(T^k) \oplus N(T^k)$ for some positive integer k.)
Feb 11 '20
2
Finding $c,b$ which minimizes $E(|X-c|)$ and $E[(X-b)^2]$
Jan 21 '20
2
prove: For any finite-dimension vector space $V$ with ordered basis $\beta$, $\phi_\beta$ is an isomorphism.
Feb 8 '20

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