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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 88,643

What does this series compute?

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**anonimnystefy****Real Member**- From: The Foundation
- Registered: 2011-05-23
- Posts: 15,600

hi bobbym

it looks like it's 1-e^(-x).

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 88,643

Did you try that at wolfram?

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**anonimnystefy****Real Member**- From: The Foundation
- Registered: 2011-05-23
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no,not really.why?

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 88,643

Because then you would know the answer before you post it.

**In mathematics, you don't understand things. You just get used to them.**

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**anonimnystefy****Real Member**- From: The Foundation
- Registered: 2011-05-23
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hi bobbym

i was running to the hill.i almost hit it.i thought those numerators were factorials.

my answer is log(x+1).

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Taking a new step, uttering a new word, is what people fear most. ― Fyodor Dostoyevsky, Crime and Punishment

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 88,643

Correct! Very, very good.

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**anonimnystefy****Real Member**- From: The Foundation
- Registered: 2011-05-23
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so that would be it.btw i'm not looking for questions only about the big oh.they can be about little oh and theta as well.the omegas too.

could you also find the threads i posted about something connected to this stuff.i used little oh but you asked if i meant big oh.it was a problem i got from 'The Tangent".

see ya tomorrow!!!

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 88,643

Okay, I will see you tomorrow, have a good night!

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**anonimnystefy****Real Member**- From: The Foundation
- Registered: 2011-05-23
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oh,and,once in a while,could you give some harder questions?

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
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Well, Big(O) is really baby stuff, the meat is Numerical Analysis.

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**anonimnystefy****Real Member**- From: The Foundation
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let's then see some from numerical analysis.

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
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You have done a little bit of it already.

How did you arrive at ln(x + 1)?

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**anonimnystefy****Real Member**- From: The Foundation
- Registered: 2011-05-23
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using Wolfram Alpha.

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
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How may I ask, I know you used alpha.

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**anonimnystefy****Real Member**- From: The Foundation
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i just entered "x-x^2/2+x^3/3-x^4/4+x^5/5+...".it spit out log(x+1)

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
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Hmmm. I see you like to prove things. Here is a question that is related in a distant way to what we are doing.

Prove there is a simple function that approximates the curve that the St. Louis Arch is.

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**anonimnystefy****Real Member**- From: The Foundation
- Registered: 2011-05-23
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some hints on how to do this.i have no idea where to start.

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
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I would start with the St.Louis Arch.

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**anonimnystefy****Real Member**- From: The Foundation
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what about?i see the pic.it looks parabolish.

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**bobbym****Administrator**- From: Bumpkinland
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Hmmm. In mathematics we try to prove things.

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**anonimnystefy****Real Member**- From: The Foundation
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well how do you suggest that?

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**anonimnystefy****Real Member**- From: The Foundation
- Registered: 2011-05-23
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hi bobbym

actually i just found out,using the almighty google,that it's a catenary.

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
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That is true, but that is not the answer to the question.

**In mathematics, you don't understand things. You just get used to them.**

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**anonimnystefy****Real Member**- From: The Foundation
- Registered: 2011-05-23
- Posts: 15,600

hi bobbym

i don't know how to prove it.could you help me?

btw,why did you close the other thread.it was supposed to be a fun game.i didn't ask you to solve it for me!

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