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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 $A$.
Aug
3
revised $A$ is a $n \times n$ matrix over $\mathbb{R}$ such that $A^2+A+5I=0$. Find the characteristic polynomial of the matrix $A$.
added 7 characters in body; edited title
Aug
3
revised Proving that the coordinate basis is a basis of a tangent space
deleted 10 characters in body
Aug
3
asked Proving that the coordinate basis is a basis of a tangent space
Jul
26
awarded  Popular Question
May
10
awarded  Popular Question
May
4
awarded  Nice Question
Mar
17
awarded  Popular Question
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
revised Prove that $\mathbb{Z}$ is a closed subset of $\mathbb{R}$
edited body
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
20
answered what is the name of this operation: $x^T\otimes B$
Jan
9
comment How to say if Eigenvectors of A are orthogonal or not? without computing eigenvectors
@Andy: en.wikipedia.org/wiki/Symmetric_matrix#Real_symmetric_matrices
Jan
9
comment How to say if Eigenvectors of A are orthogonal or not? without computing eigenvectors
Do you know the Spectral theorem?