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# 43 Reviews

 Jan 4 reviewed Approve How to find the inverse of this matrix? Aug 3 reviewed Edit $A$ is a $n \times n$ matrix over $\mathbb{R}$ such that $A^2+A+5I=0$. Find the characteristic polynomial of the matrix $A$. Jan 30 reviewed Approve Counterexample for “subsequence of a convergent sequence is convergent to same limit” Jan 30 reviewed Approve What is the best book for coordinate geometry? Jan 28 reviewed Approve Prove that $\mathbb{Z}$ is a closed subset of $\mathbb{R}$ Jan 26 reviewed Approve Trigonometry book which develops geometric intuition. Jan 26 reviewed Looks OK lower bound on matrix norm inequality of sum Jan 26 reviewed Looks OK Trace of a matrix $A$ with $A^2=I$ Jan 26 reviewed Approve Is it unlikely to get the same number of heads/tails? Jan 26 reviewed Approve Cohen-Macaulay and regular rings Jan 7 reviewed Approve Operations on sets with answers Jan 7 reviewed Approve Is time a continuous random variable? Jan 4 reviewed Approve Why is this $0 = 1$ proof wrong? Jan 4 reviewed Edit Maximizing volume in Calculus Jan 4 reviewed Edit How is this a counter example to “ $A$ and $B$ are isomorphic but $G/A \ncong G/B”$? Jan 4 reviewed Looks OK How to compute sum with non consecutive indices in Maple? Jan 3 reviewed Approve Near-rings: why are ideals defined like that? Jan 3 reviewed Approve Regression vs Classification Jan 3 reviewed No Action Needed Equation of a cubic function with inflection point on (0.5,0.5) and contains (0,0), (1,1) Jan 2 reviewed Approve A p-Sylow subgroup of a subgroup is a p-sylow subgroup of the group