Apparently, this user prefers to keep an air of mystery about them.
45 What is the meaning of the expression Q.E.D.? Is it similar to ■ appearing at the end of a theorem? Feb 19 '15
14 To prove Cayley-Hamilton theorem, why can't we substitute $A$ for $\lambda$ in $p(\lambda) = \det(\lambda I - A)$? Feb 10 '15
14 Are there any other constructions of a finite field with characteristic $p$ except $\Bbb Z_p$? Apr 12 '13
12 how to prove $G_1$ and $G_2$ aren't isomorphic? Mar 5 '13
11 Can an empty set be both torsion and torsion free group? Nov 26 '14