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visits member for 11 months
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2h
comment rational fractiona function solving for zero
@N.F.Taussig Indeed. Thank you, I fixed my answer.
2h
revised rational fractiona function solving for zero
edited body
2h
revised rational fractiona function solving for zero
added 7 characters in body
2h
answered rational fractiona function solving for zero
8h
comment Resolvent matrix
@Michele Then you can at least find the Jordan normal form of the matrix. In any case, even simply calculating $(xI-A)^{-1}$ is not a difficult operation to perform if $A$ is triangular.
8h
comment Square root of a negative number squared
+1 for the link to the principal branch. It is so easy to simply say that $\sqrt{-1}=i$ without mentioning that expanding square roots to complex numbers is not trivial.
9h
answered What does 'express in terms of $x$' mean?
9h
comment Difficult percentage question
Hi and welcome to the site! Since this is a site that encourages learning, you will get much more help if you show us what you have already done. Could you edit your question with your thoughts and ideas?
9h
answered Square root of a negative number squared
9h
answered Resolvent matrix
10h
comment Solving for the roots of a polynomial
@Jacob I do apologize, my warning was premature. But let me just explain myself: I saw a question in which a new user asked about how to calculate a characteristic polynomial, and a second question posted later about finding the roots of that polynomial. This second question means that the user found the characteristic polynomial, meaning one of the answers he got was good for him, but not accepted. And too many times, that means the user is behaving inapropriately for the site. I am glad to know I misjudged you.
10h
comment How to solve this equation if we can't use Chinese remainder theorem.
That... doesn't really answer the question.
10h
comment Solving for the roots of a polynomial
@jacob You are not being flagged for anything, since you accepted the answers now. At the time of my writing, you you have not accepted the answer to your previous question (or at least it has not been registered yet).
10h
comment Solving for the roots of a polynomial
I see you already asked 8 questions. Some were answered, some were not. In the answers where you recieved answers, you are expected to either accept one of them or explain why it is not the answer you are looking for. Consider this a warning and start to behave as expected for the site. If you do not, you will be flagged and you questions will, once the community realizes what you are doing, no longer be answered.
10h
comment Find the eigenvalues of the following matrix
@Jacob But since $f_A$ IS EXACTLY the determinant of the matrix $A-\lambda I$, it is impossible to find one without finding the other. The fact that the first element is $(-1)^n$, the second $tr(A)$ and the last $\det A$ are all consequences of the definition of $f_A$. Your book probably uses that definition too, and there is no easy way of calculating the factor next to $\lambda^{n-2}$.
10h
answered Find the eigenvalues of the following matrix
1d
comment P=NP and human thought
Why would equaling 23 with 2 plus 3 in any way be related to P=NP?
1d
answered multiple dice probabilities…
1d
comment Expected value of the sum of the two largest values from a Uniform parent
That comment makes no sense at all.
1d
comment Expected value of the sum of the two largest values from a Uniform parent
Take a look at $n=1,2,3$