Discussion about math, puzzles, games and fun.   Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ • π ƒ -¹ ² ³ °

You are not logged in.

## Post a reply

Write your message and submit
|
Options

## Topic review (newest first)

anonimnystefy
2012-09-02 21:05:52

Hi rajinikanth0602

What problems do you see in post #19?

bobbym
2012-09-02 19:18:23

Hi;

Did you see post #32?

i will challenge that i will give 7000 rupees for solving dis problem or any important information about that sequence or range of that sequence

In exchange for the rupees I would like your acknowledgement that the problem has been solved with the proof that is in post#32, or do you require more?

As for post #19. It may be correct, I do not know. Still it is a very nice piece of work by a good man.

rajinikanth0602
2012-09-02 19:17:30

i think post reply ''19'' is not correct

bobbym
2012-08-15 23:35:48

Hi rajinikanth0602;

By the ratio test:

By the ratio test the series diverges for all values of x.

rajinikanth0602
2012-08-15 23:05:45

hi bobbym any information about my question

bobbym
2012-07-23 07:01:52

Yes, it could.

anonimnystefy
2012-07-23 03:52:02

It can be an expression in terms of x.

bobbym
2012-07-23 03:49:48

With a variable as the upper index yes. But with an infinity up there the sum is either a constant like 1 / 2 ( just picked as an example ) or ∞.

anonimnystefy
2012-07-23 03:47:03

It is possible.

bobbym
2012-07-23 03:45:44

If you meant an expression for the closed form then it is obviously not possible. The sum will either equal a constant or infinity.

anonimnystefy
2012-07-23 03:40:41

bobbym
2012-07-23 03:28:03

anonimnystefy
2012-07-23 03:10:29

Upper index of summation?

bobbym
2012-07-23 03:08:09

How can you get a closed form? The upper index of summation is not a variable. Either it sums to some constant or it diverges.

anonimnystefy
2012-07-23 03:01:55

Hi bobbym

S(sqrt(x)) is the same as the sum above. I just want a closed form. Like 1/(1-x) is the EGF for:

even though the sequence doesn't converge.