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4h
revised The number of integral solutions $(x,y)$ of $x^3+3x^2y+3xy^2+2y^3=50653$
better title
22h
comment A few questions related to a Markov chain.
Could you calculate a simpler probability (than #2), like $P[X(1)=1|X(0)=0]$?
23h
comment A few questions related to a Markov chain.
Do you have a book in which you can look up what it means, or notes from a lecture where it was introduced?
23h
comment A few questions related to a Markov chain.
What have you tried? Do you have any thoughts at all about any of these questions? Do you know, for instance, what aperiodic means?
2d
comment Prove that functional series $\sum_{n=1}|sinx|^{\sqrt{n}}$ is convergent when $x \in (-1,1)$
Have you tried comparisons with known convergent series?
2d
comment Prove that functional series $\sum_{n=1}|sinx|^{\sqrt{n}}$ is convergent when $x \in (-1,1)$
Can you prove, for instance, that $\sum_{n=1}^{\infty} \left( \frac{1}{2}\right)^{\sqrt{n}}$ is convergent?
2d
comment Partitions of a number with greatest product
Have you worked this out for small n? Do you see a pattern? Share your thoughts.
Apr
25
revised finding counterexample for identity of sets
spelling in title
Apr
18
revised Maximizing $x_1 x_2 x_3\cdots x_m\left(\frac{1}{x_1}+\frac{1}{x_2}+\frac{1}{x_3}+\ldots + \frac{1}{x_m} - 1\right)$
better title
Apr
13
revised Proof of $[(a \; \text{mod} \; n)+(b \; \text{mod} \; n)] \equiv (a+b)\; \text{mod}\; n$
better title
Apr
11
revised Finding last 2 digits of $2016^{500}$ without repeated squaring
better title, intro
Apr
8
comment Rearanging Six Variables
I don't see $z$ defined anywhere, but you use it in your last three expressions. What is $z$?
Apr
6
revised what is the initial temperature of the object?
retagged, but the problem statement is very poor
Apr
4
comment Showing a parametrization of the ellipsoid
What is your definition of an ellipsoid?
Mar
30
comment Landing on a Community Chest in Monopoly on your second turn?
Nice work. Simulation seems like a good way to go, since who needs this probability exactly anyway? Cheers!
Mar
30
comment Landing on a Community Chest in Monopoly on your second turn?
I think you have ignored the possible effect of the Chance square.
Mar
22
revised Finding a formula for the expected value
clarification
Mar
16
revised Proving $\{9^n|n\in \mathbb Q\} = \{3^n|n\in \mathbb Q\}$
better title and Q
Mar
9
revised Prove that $\sin(x) + \cos(x) \geq 1$
removed proof-ver tag, since no proof is presented
Mar
9
revised Does $a_n$ increasing imply $a_n-\frac{1}{n}$ strictly increasing?
better title