Sarastro
Reputation
1,588
Next privilege 2,000 Rep.
 May 18 reviewed No Action Needed Limit integral w/ sine function May 17 comment Proving Irreducibility of $x^4-16x^3+20x^2+12$ in $\mathbb Q[x]$ Do you know Gauss' Lemma? May 16 comment In a commutative ring with identity, if $p$ is irreducible, is ($p$) a maximal ideal? I will have to think about it May 16 comment In a commutative ring with identity, if $p$ is irreducible, is ($p$) a maximal ideal? In a general commutative ring $R$, $R/I$ is a field iff $I$ is maximal in $R$. So, what you are really asking is: if $(p)$ is maximal whenever $p$ is irreducible, is $R[X]$ a PID? May 16 answered In a commutative ring with identity, if $p$ is irreducible, is ($p$) a maximal ideal? May 14 reviewed Reviewed Mathematically, why was the Enigma machine so hard to crack? May 14 reviewed No Action Needed Precedence of nested NOTs in boolean algebra May 14 reviewed No Action Needed Simple question in Rank May 14 reviewed No Action Needed norms of row matrices May 13 reviewed No Action Needed Finite differences on a hexagonal/triangular lattice with Cartesian coordinates May 13 reviewed No Action Needed Generalization of the Weierstrass M-test? May 12 comment $A$ is normal matrix.If $A{A^T}$ has $n$ distinict eigenvalue,why $A$ is symmetric? $A$ normal means that $AA^T=A^TA$. But $AA^T=A^TA$ does not imply $A=A^T$ in general. May 10 awarded Yearling May 9 reviewed No Action Needed Trigonometry with quadrilateral and triangles May 9 reviewed No Action Needed When is a matrix diagonalizable? May 6 reviewed No Action Needed Multiplicity of an eigenvalue=number of times it appears on the diagonal? May 6 reviewed No Action Needed Calculating average rolling cost stock for bulk products May 4 reviewed No Action Needed Showing that the complete bipartite graph $K_{a,b}$ is a tree if and only if $a=1$ or $b=1$. May 3 reviewed No Action Needed Why is “the set of all sets” a paradox? May 3 reviewed No Action Needed Matrix norm inducted by infinite vector norm