# Search results

1. ### A Question about continued fraction representations

How powerful are continued fraction representations? From what I understand, they could be used to exactly represent some irrational numbers So, could they represent any root of an nth degree polynomial equation? Specially where n>4, since 5th degree roots are not guaranteed to have an...
2. ### Proving inequalities with logarithm

I need to prove: (n+1)*(log(n+1)-log(n) > 1 for all n > 0. I have tried exponentiating it and I got ( (n+1)/n )^(n+1) < e. And from there I couldn't go any farther, but I do know that it is true by just looking at its graph. Could anybody help me please?
3. ### Implications of varying the definition of the derivative?

I have been playing around with calculus for a while and I wondered what would it be like to make some changes to the definition of derivatives. I'd like to look at the original definition of derivatives in this way (everything is in lim Δx→0): F(x+Δx) - F(x) = F'(x) * Δx The Δx factor...
4. ### Why are linear equations usually written down as matrices?

I've been taught that for any system of linear equations, it has a corresponding matrix. Why do people sometimes use systems of linear equations to describe something and other times matrices? Is it all just a way of writing things down faster or are there things you could do to matrices that...
5. ### Help in proving this inequality

Can somebody help me please, I've tried solving this for hours but I still couldn't get it. Given that a, b, c, d are positive integers and a+b=c+d. Prove that if a∗b < c∗d, then a∗log(a)+b∗log(b) > c∗log(c)+d∗log(d) How do I do it?
6. ### How to test if a sequence converges?

Given a sequence, how to check if it converges? Assume the sequence is monotonic but the formula that created the sequence is unknown. My first thought was if: seq(n+2) - seq(n+1) < seq(n+1) - seq(n) , is always true as n->infinity then it is convergent. Or in other words, if the difference...
7. ### How do I simplify this expression with a floor function?

I would want to change this expression to another one that would have P easily accessible. \frac{\left \lceil (n+1)^{P} \right \rceil}{\left \lceil n^{P} \right \rceil} As an example of 'accessible'; given (n+1)^P / n^P, I can make P more accessible by using log(). Then it becomes P *...
8. ### How to solve this asymptotic equality?

How do I solve for x in the relationship below: nx ~ n ln(n), as n -> infinity The answer that I'm getting is x=1, but that must be wrong since 1 ~ ln(n) as n-> infinity is wrong.
9. ### Which sequence acceleration method should I use?

The sequence that I'm working with is sorta monotonic. It's monotonic most of the time, sometimes there's one number that ruins the trend like 0.0001001 in 0.1, 0.01, 0.001, 0.0001001, 0.0001, ... but those are very rare. Btw, the sequence above is just an example. Is Richardson extrapolation...
10. ### What makes these initial functions so special?

People say that if you could break a function down into these three functions (constant, successor, projection or sometimes called initial/basic functions) using some operators, then it is primitive recursive. What makes these three functions so special?
11. ### What does the Comp function mean?

I've been looking at this proof -> http://basics.sjtu.edu.cn/~liguoqiang/teaching/comp14/materials/Ackermann.pdf [Broken] At the bottom of the second page, there is this thing which looks like this: http://s24.postimg.org/sxtz7pef9/what.png Could someone please explain what that function with...
12. ### How to simplify log(ln(x))

Outer log could be any base.
13. ### How to solve for a function that is asymptotic to a sequence

I have a sequence of natural numbers which is generated by a really complicated function. This function only takes in natural numbers. How do I solve for a function that is asymptotic to the sequence? If I have a sequence of ans, I want a function that satisfies f(n) ~ an as n -> infinity.
14. ### How to approximate the rate of growth of an integer sequence?

Assume that I have absolutely no clue to what is the formula used to generate a sequence. How do I know what kind of formula that is? (Exponential / Linear / Polynomial / etc) Also assume that there is only 1 formula that generates the sequence. I have read somewhere before that: f'(x) ~...
15. ### Question on solving linear recurrence relations

Why does the characteristic equation of a linear recurrence relation always look like an = series of constants multiplied by a number raised to n
16. ### Why is the fundamental theorem of arithmetic special?

Why is it significant enough to be fundamental? Some people say that it is fundamental because it establishes the importance of primes as the building blocks of positive integers, but I could just as easily 'build up' the positive integers just by simply iterating +1's starting from 0.
17. ### What is the derivative of a sexp()

d(x^^n)/dx = ?
18. ### Is there a "binomial" theorem for super exp or tetration?

In the binomial theorem (x+x')^n = a summation of terms. Is there any way I could express (x+x')^^n in a summation?
19. ### Converting a recursion to a loop

public static int function(int n, int a, int b){ if (n>0){ if(b==0) return a; else return function(n-1,a,function(n,a,b-1)); } return b; } I have a recursive function of this form, how do I convert it to a loop?
20. ### Space Time Equality

Is it true that the speed of light is a conversion factor between time and space? and that D = C*T? and if it is, how does that make any sense?
21. ### Entropy and fluctuation

The 2nd law of thermodynamics state that entropy increases with time and entropy is just a measure of how hard it is to distinguish a state from another state (information theoretical view) or how hard it is to find order within a system (thermodynamic view). There are many ways to view entropy...
22. ### Summing divergences and the real projective line

The real projective line states that there is not difference between positive and negative infinity (maybe except the path needed to be taken to "reach" either one of them) and they are actually connected. There are a lot of ways to get a definite sum from a divergent series; one of which is...