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## #1 2016-01-09 23:39:14

bobbym
bumpkin
From: Bumpkinland
Registered: 2009-04-12
Posts: 109,606

### How to do it.

Hi;

This sum

comes up on another forum where it is solved using typical methods. Let us see what else can be done.

We see powers of 3 in the denominator and remember that the generating function

has that property. If we generate a few terms of that series we get:

and a few terms of G(x)

To make B look like A we see that we just have to multiply B by 9:

and say x = 1.

So the generating function for A is

To sum the original series we just substitute x = 1 in G(x).

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

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## #2 2016-02-12 16:04:42

anonimnystefy
Real Member
From: Harlan's World
Registered: 2011-05-23
Posts: 16,045

### Re: How to do it.

Ooh, I miss these!

I think I might post a similar thing (or two), but maybe in Euler's Avenue; it's not really Computer Math. I had a Descrete Mathematics course this semester, and the prof showed us some very cool proofs involving partitions, mostly combinatorial!

Here lies the reader who will never open this book. He is forever dead.
Taking a new step, uttering a new word, is what people fear most. ― Fyodor Dostoyevsky, Crime and Punishment
The knowledge of some things as a function of age is a delta function.

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## #3 2016-02-12 16:06:13

bobbym
bumpkin
From: Bumpkinland
Registered: 2009-04-12
Posts: 109,606

### Re: How to do it.

Euler did the first work on them so...

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

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## #4 2016-02-12 16:19:27

anonimnystefy
Real Member
From: Harlan's World
Registered: 2011-05-23
Posts: 16,045

### Re: How to do it.

Yeah, there is some of his stuff and also some of Ramanujan.

Here lies the reader who will never open this book. He is forever dead.
Taking a new step, uttering a new word, is what people fear most. ― Fyodor Dostoyevsky, Crime and Punishment
The knowledge of some things as a function of age is a delta function.

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## #5 2016-02-12 16:25:04

bobbym
bumpkin
From: Bumpkinland
Registered: 2009-04-12
Posts: 109,606

### Re: How to do it.

Do not forget about ole G.H.

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

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## #6 2016-02-12 16:32:41

anonimnystefy
Real Member
From: Harlan's World
Registered: 2011-05-23
Posts: 16,045

### Re: How to do it.

No, of course. There was mention of him as well.

I particularly liked Borcherds's proof of Jacobi's triple product identity. Very elegant!

Here lies the reader who will never open this book. He is forever dead.
Taking a new step, uttering a new word, is what people fear most. ― Fyodor Dostoyevsky, Crime and Punishment
The knowledge of some things as a function of age is a delta function.

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## #7 2016-02-12 16:37:49

bobbym
bumpkin
From: Bumpkinland
Registered: 2009-04-12
Posts: 109,606

### Re: How to do it.

I have never seen it. See you later and Happy Birthday.

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

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## #8 2016-02-12 16:56:13

anonimnystefy
Real Member
From: Harlan's World
Registered: 2011-05-23
Posts: 16,045

### Re: How to do it.

See ya around! And thanks!

Here lies the reader who will never open this book. He is forever dead.
Taking a new step, uttering a new word, is what people fear most. ― Fyodor Dostoyevsky, Crime and Punishment
The knowledge of some things as a function of age is a delta function.

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## #9 2016-06-16 17:12:39

Agnishom
Real Member
From: Riemann Sphere
Registered: 2011-01-29
Posts: 24,910
Website

### Re: How to do it.

bobbym wrote:

Let us see what else can be done.

We see powers of 3 in the denominator and remember that the generating function

has that property.

How did you find that gf?

'And fun? If maths is fun, then getting a tooth extraction is fun. A viral infection is fun. Rabies shots are fun.'
'God exists because Mathematics is consistent, and the devil exists because we cannot prove it'
I'm not crazy, my mother had me tested.

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## #10 2016-06-16 17:15:18

bobbym
bumpkin
From: Bumpkinland
Registered: 2009-04-12
Posts: 109,606

### Re: How to do it.

When doing combinatorics people who do not have M use tables of these. Some you get to know by heart.

But you can try to get the gf using M.

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

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## #11 2016-06-16 17:27:42

Agnishom
Real Member
From: Riemann Sphere
Registered: 2011-01-29
Posts: 24,910
Website

### Re: How to do it.

How is that?

'And fun? If maths is fun, then getting a tooth extraction is fun. A viral infection is fun. Rabies shots are fun.'
'God exists because Mathematics is consistent, and the devil exists because we cannot prove it'
I'm not crazy, my mother had me tested.

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## #12 2016-06-16 17:32:18

bobbym
bumpkin
From: Bumpkinland
Registered: 2009-04-12
Posts: 109,606

### Re: How to do it.

Table[(n + 1)/3^n, {n, 0, 10}]

FindGeneratingFunction[{1, 2/3, 1/3, 4/27, 5/81, 2/81, 7/729, 8/2187, 1/729, 10/19683, 11/59049}, x]

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

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## #13 2016-06-16 17:34:02

Agnishom
Real Member
From: Riemann Sphere
Registered: 2011-01-29
Posts: 24,910
Website

### Re: How to do it.

How does FindGeneratingFunction work?

'And fun? If maths is fun, then getting a tooth extraction is fun. A viral infection is fun. Rabies shots are fun.'
'God exists because Mathematics is consistent, and the devil exists because we cannot prove it'
I'm not crazy, my mother had me tested.

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## #14 2016-06-16 17:36:00

bobbym
bumpkin
From: Bumpkinland
Registered: 2009-04-12
Posts: 109,606

### Re: How to do it.

The built in command? Much of M is a big secret but gAr and I had talked about some methods.

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

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## #15 2016-06-16 17:41:33

Agnishom
Real Member
From: Riemann Sphere
Registered: 2011-01-29
Posts: 24,910
Website

### Re: How to do it.

Where are those conversations?

'And fun? If maths is fun, then getting a tooth extraction is fun. A viral infection is fun. Rabies shots are fun.'
'God exists because Mathematics is consistent, and the devil exists because we cannot prove it'
I'm not crazy, my mother had me tested.

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## #16 2016-06-16 17:44:12

bobbym
bumpkin
From: Bumpkinland
Registered: 2009-04-12
Posts: 109,606

### Re: How to do it.

They are scattered around this forum. But they can found by looking at gAr's posts.

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

Offline