What's the relation (IMPORTANT)?

In summary, the conversation is about finding a continuous function that represents the relation between a set of numbers. The numbers in question are the harmonic numbers, and while there is an explicit formula for the nth term, the person is looking for a continuous function that represents these numbers. After some discussion and links to relevant formulas, the person is ultimately satisfied with the information provided.
  • #1
TheDestroyer
402
1
What's the relation (IMPORTANT)??

Hi guys, let me introduce my self, I'm a physicist studying in the university of aleppo...

I want the relation between those number as a continuous function, my head is going to blow ! i can't find it, can anyone help?

x->y

1->1

2->3/2

3->11/6

4->25/12

5->137/60

6->147/60

7->363/140

8->761/280

9->7192/2520

hint: I can see that every number (y) is multiplied by 1/x

PLEASE, I don't want any approximation, interpolation or anything like that because i can do it alone, i need an exact function

for example, beta, gamma, airy, fresnels s and c, hermite, legender, or anything else BUT PLEEEEASE AN EXACT FUNCTION,

I've attached the graph of this damn function

It's not an easy question, i don't think I'm receiving an answer before 10 years, lol !

Thanks Guys
 

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  • #2
Those look like the harmonic numbers:

[tex]H_n = \sum_{k=1}^n \frac{1}{k} [/tex]

I don't believe there is an explicit formula for the nth term, but I could be wrong.

EDIT: I'm sorry. Apparently there is one, although I don't know how useful it would be to you. See the mathworld article on harmonic numbers.
 
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  • #3
Thank you, but i wanted it as a CONTINUOUS FUNCTION, not as a sum, integrals can be accepted as i mentioned above, thanks anyway for the link, any other ideas?
 
  • #4
Well, as the link mentions, the Harmonic numbers are given by:

[tex]H_n = \gamma + \psi_0(n+1)[/tex]

where [itex]\gamma[/itex] is the Euler-Masceroni constant and [itex]\psi_0(x)[/itex] is the digamma function, related to the gamma function [itex]\Gamma(x)[/itex] by:

[tex]\psi_0(x) = \frac{\Gamma'(x)}{\Gamma(x)}[/tex]

So the function:

[tex]f(x)=\gamma + \psi_0(x+1)[/tex]

Is a continuous function which has the Harmonic numbers as its value at the positive integers.
 
  • #5
TheDestroyer said:
Thank you, but i wanted it as a CONTINUOUS FUNCTION, not as a sum, integrals can be accepted as i mentioned above, thanks anyway for the link, any other ideas?

Did you look at the link? The answer you want is there.
 
  • #6
Sorry, The time was 2 am, and i saved the link and went to bed, thank you guys, i got what i want

Thanks again
 
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  • #7
I've edited the original post (and the subthread related to what I cut out) in the hopes that I don't have to lock this.
 
  • #8
LOL ! Why should you Hurkyl?? we didn't do anything wrong, did we? it's just a discussion about sciences !
 
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FAQ: What's the relation (IMPORTANT)?

What is the importance of understanding the relation between variables?

The relationship between variables is crucial in the scientific method as it helps us understand how changes in one variable can affect another. This allows us to make accurate predictions and draw meaningful conclusions from our data.

How do you determine the strength of a relationship between variables?

The strength of a relationship between variables can be determined by calculating the correlation coefficient. This is a statistical measure that ranges from -1 to 1, with a value closer to 1 indicating a strong positive relationship, a value closer to -1 indicating a strong negative relationship, and a value close to 0 indicating no relationship.

How can you establish a cause-and-effect relationship between variables?

To establish a cause-and-effect relationship between variables, we need to conduct experiments where we manipulate one variable (independent variable) and observe the changes in another variable (dependent variable). This allows us to determine if changes in the independent variable directly cause changes in the dependent variable.

Can there be multiple relationships between variables?

Yes, there can be multiple relationships between variables. In some cases, variables may have a direct relationship, while in others, they may have an indirect or complex relationship. It is important to thoroughly analyze the data to understand all possible relationships between variables.

How does understanding the relationship between variables help in problem-solving?

Understanding the relationship between variables helps in problem-solving by allowing us to identify the key factors that contribute to a problem. This allows us to develop targeted solutions that address the root cause of the problem rather than just treating the symptoms.

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