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0 
Questions Asked

RolyPoly:
Group Title
Solve the IVP x"  2tx' + 4x = 0, x(0) = 1, x'(0) = 0.
How to start?
 updated 11 days ago
 49 replies
 3 Medals
Mathematics

RolyPoly:
Group Title
Find the inverse of \(f(x) = x^\frac{1}{n}\)
 updated 5 months ago
 9 replies
 No Medals Yet
Mathematics

RolyPoly:
Group Title
How to find the close form of
\(a_n =\frac{1}{8}a_{n2} \frac{1}{4}a_{n−1}\) given that \(a_1 = 0, a_2 = 1\)?
 updated 5 months ago
 41 replies
 3 Medals
Mathematics

RolyPoly:
Group Title
Prove that the sequence \((a_n)_{n\in \mathbb{n}}\) is bounded iff the sequence \((a_n)_{n\in \mathbb{n}}\) is bounded from above.
 updated 6 months ago
 6 replies
 3 Medals
Mathematics

RolyPoly:
Group Title
Suppose \(\lim_{x\rightarrow a}f(x) = c\). How can I show that \(\lim_{x\rightarrow a} \sqrt[n]{f(x)} \) exists for all n in \(\mathbb{N}\)?
 updated 6 months ago
 29 replies
 No Medals Yet
Mathematics

RolyPoly:
Group Title
<Problem with notation>
Does \(\sqrt[n]{f(x)^m}\) mean \([f(x)]^\frac{m}{n}\)?
 updated 6 months ago
 3 replies
 1 Medal
Mathematics

RolyPoly:
Group Title
Given \(a_1 = 1\), \(b_1=\frac{1}{2}\), and
\(a_n = \frac{a_{n1}}{b_{n1}}\) and \(b_n = a_{n1}*b_{n1}\) for all n>1.
Show that \((a_n)…
 updated 6 months ago
 12 replies
 1 Medal
Mathematics

RolyPoly:
Group Title
Prove that \(\lim_{N\rightarrow \infty}N\sum_{n=N}^{\infty}\frac{1}{n^2}\) exists.
 updated 6 months ago
 33 replies
 3 Medals
Mathematics

RolyPoly:
Group Title
How to prove that a series is convergent by using Cauchy Convergence Criterion for Series?
 updated 7 months ago
 100 replies
 5 Medals
Mathematics

RolyPoly:
Group Title
Why is masking off an interrupt a privileged instruction?
 updated 2 months ago
 25 replies
 1 Medal
Mathematics

RolyPoly:
Group Title
Given \(\mathbb{F}\) is an ordered field, prove 1>0.
 updated 8 months ago
 15 replies
 No Medals Yet
Mathematics

RolyPoly:
Group Title
There is a line "And I think to myself what a wonderful world" in the song What a Wonderful World by Louis Armstrong. My question is, what i…
 updated 10 months ago
 1 reply
 No Medals Yet
Mathematics

RolyPoly:
Group Title
Let A and B be square matrices of the same size. If A and B are both ______, so is AB.
1) symmetric
2) invertible
…
 updated one year ago
 31 replies
 1 Medal
Mathematics

RolyPoly:
Group Title
Let A be a 4x7 matrix with rank 4. Which of the following(s) is/are true?
1) the rows of A are linearly independent
2) the columns of A mu…
 updated one year ago
 12 replies
 1 Medal
Mathematics

RolyPoly:
Group Title
Find the range of the function \(f(x) = x^\frac{1}{x}\)
 updated one year ago
 11 replies
 7 Medals
Mathematics

RolyPoly:
Group Title
Is this statement true?
"If U, W are subspaces of \(\mathbb{R}^n\) and dim U + dim W = n, then \(U\cap W = {0}\)"
 updated one year ago
 3 replies
 2 Medals
Mathematics

RolyPoly:
Group Title
Given A and B are subspaces of \(\mathbb{R}^n\). Is A+B a subspace of \(\mathbb{R}^n\) in general, given that A+B = {\(\vec{a} + \vec{b}  \…
 updated one year ago
 No Medals Yet
Mathematics

RolyPoly:
Group Title
What can you tell about the eigenvalues of matrix \(A^2\) if an eigenvalue of matrix \(A\) is \(\lambda\) and the corresponding eigenvector…
 updated one year ago
 1 reply
 No Medals Yet
Mathematics

RolyPoly:
Group Title
The number of passengers of terminal A, A(n) and terminal B, B(n), in the nth year are \(A(n)=2pq^n\) and \(B(n) = npq^2\), where p and q ar…
 updated one year ago
 33 replies
 3 Medals
Mathematics

RolyPoly:
Group Title
A student committee consists of 20 boys and 15 girls. A team of 8 students is selected randomly from the committee to participate in an acti…
 updated one year ago
 33 replies
 3 Medals
Mathematics

RolyPoly:
Group Title
Why do we use radian instead of degree in "higher mathematics", for example, in calculus?
 updated one year ago
 9 replies
 No Medals Yet
Mathematics

RolyPoly:
Group Title
It is known that a system has infinitely many solutions.
What happens when such a real system has a unique solution?
 updated one year ago
 No Medals Yet
Mathematics

RolyPoly:
Group Title
Given an undirected graph H, let C be the adjacency matrix of H. What is the meaning of entries in \(C^n\)?
 updated one year ago
 20 replies
 2 Medals
Mathematics

RolyPoly:
Group Title
Write a recursive algorithm S(C,D,m,n) with the following requirements:
1) C is an array with m elements stored in positions C[1,...,m]
2)…
 updated one year ago
 13 replies
 No Medals Yet
Mathematics

RolyPoly:
Group Title
Use MI to prove that \(n^21\) is divisible by 8 for any positive odd integer n.
 updated one year ago
 8 replies
 1 Medal
Mathematics

RolyPoly:
Group Title
Solve the following recurrence:
\[f(x) =\begin{cases} x & x \le 3 \\ f(x3) + 4 & x > 3\end{cases}\]
 updated one year ago
 76 replies
 2 Medals
Mathematics

RolyPoly:
Group Title
<Linear Algebra>
Prove that a system of linear equations cannot have exactly two solutions.
 updated one year ago
 23 replies
 2 Medals
Mathematics

RolyPoly:
Group Title
<Linear Algebra>
In the process of solving a system of linear equations, we have three elementary row operations, which are
(I) Exchange t…
 updated one year ago
 39 replies
 3 Medals
Mathematics

RolyPoly:
Group Title
Consider f(n) = lg(n).
What is the largest size n of the problem that can be solved in 1 second, assuming that the time required to solve t…
 updated one year ago
 82 replies
 1 Medal
Mathematics

RolyPoly:
Group Title
Whether zero is a natural number or not is still controversial.
What is the (mathematical) argument for 0 *NOT* being a natural number?
 updated one year ago
 8 replies
 1 Medal
Mathematics

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