# Summation Question

1. Aug 24, 2008

### missusa

write out the following sum and compute where possible

$$\sum 3$$ x =0 (x2 + 2x + 2)

is that clear???

2. Aug 24, 2008

### malawi_glenn

do you mean

$$\sum _{n = .3}(x^2+2x+2) = ?$$

when $$x=0$$

??

Now where is the index $n$ in the expression to be summed over?

And where is your attempt to solution?

3. Aug 24, 2008

### CompuChip

Malawi that doesn't make much sense either.
Missusa, if you can't write proper LaTeX, it's better to do it completely without. For example, write
"Sum from n = 1 to infinity of (e^(-n / 3) / n^2)"

4. Aug 24, 2008

### Integral

Staff Emeritus
Maybe OP means:

$$\sum^3 _{x= 0}(x^2+2x+2)$$

5. Aug 24, 2008

### HallsofIvy

Staff Emeritus
Is Integral right about what you mean? Then the sum, from x= 0 to 3 means you replace the "x" in x2+ 2x+ 2 by 0, then by 1, then by 2, then by 3, and add:
(02+ 3(0)+ 2)+ (12+ 2(1)+ 2)+ (22+ 2(2)+ 2)+ (32+ 2(3)+ 2)

6. Aug 24, 2008

### Staff: Mentor

That's about the only way I see it making sense. Same as if the limits of summation were n = 0, 3 and x = n, an integer.

7. Aug 24, 2008

### missusa

Thank you so much you two are very smart...I do appreciate your help. That is what I meant but I could not write it the way it was.

Thanks again,

8. Aug 24, 2008

### missusa

Can I get some information about Endogenous Moeny: honrizontalism and structuralism??

9. Aug 24, 2008

### Dick

Definitely not. Especially if you are talking about Levi-Strauss anthropological structuralism with gratuitous misspellings.

10. Aug 25, 2008

### Staff: Mentor

That would be better suited in another thread, either in other sciences or in the economic forums.

Ostensibly, such a disussion is found in one's macroeconomic textbook, or one can search on Google with the keywords. Nevertheless -

http://www.trincoll.edu/~setterfi/Horizontalism,%20Structuralism%20and%20Historical%20Time.pdf [Broken]

Complexity, Endogenous Money and Macroeconomic Theory By Mark Setterfield

http://cas.umkc.edu/econ/economics/faculty/Fontana/Winter 2005/ROPE.pdf

Last edited by a moderator: May 3, 2017
11. Aug 25, 2008

Thank You!