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## #1 2013-07-02 13:54:06

Amartyanil
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### 7 bridges

What is the seven bridges?

"The most incomprehensible thing about the universe is that it is comprehensible." -Albert Einstein

## #2 2013-07-02 14:02:39

bobbym

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### Re: 7 bridges

Hi Amartyanil;

The seven bridges of konigsberg is an amazing problem first investigated and solved by Leonhard Euler.

http://www.mathsisfun.com/activity/seve … sberg.html

In mathematics, you don't understand things. You just get used to them.
I have the result, but I do not yet know how to get it.
All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

## #3 2013-07-02 14:08:02

Agnishom
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### Re: 7 bridges

Didn't know there's an MIF page on it

'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'
'Who are you to judge everything?' -Alokananda

## #4 2013-07-02 14:11:06

bobbym

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### Re: 7 bridges

There is an MIF page on everything.

#### pappym wrote:

Seek and ye shall find.

In mathematics, you don't understand things. You just get used to them.
I have the result, but I do not yet know how to get it.
All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

## #5 2013-07-02 14:13:10

Agnishom
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### Re: 7 bridges

There is an MIF page on everything.

Nope. Atleast sphider doesn't get it.

http://www.mathsisfun.com/sphider/search.php?query=everything&submit=Search&search=1

'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'
'Who are you to judge everything?' -Alokananda

## #6 2013-07-02 14:16:38

bobbym

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### Re: 7 bridges

I did not mean everything in the exact sense there is no page about me there...

In mathematics, you don't understand things. You just get used to them.
I have the result, but I do not yet know how to get it.
All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

## #7 2013-07-02 14:47:03

Agnishom
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### Re: 7 bridges

You can ask him to make one

'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'
'Who are you to judge everything?' -Alokananda

## #8 2013-07-02 14:47:35

bobbym

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### Re: 7 bridges

I did, he won't budge!

In mathematics, you don't understand things. You just get used to them.
I have the result, but I do not yet know how to get it.
All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

## #9 2013-07-02 14:51:46

Agnishom
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### Re: 7 bridges

We do not have a page about N-Queens either

'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'
'Who are you to judge everything?' -Alokananda

## #10 2013-07-02 14:52:33

bobbym

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### Re: 7 bridges

That is right but I have a good post about it.

In mathematics, you don't understand things. You just get used to them.
I have the result, but I do not yet know how to get it.
All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

## #11 2013-07-02 14:56:48

Agnishom
Real Member

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### Re: 7 bridges

'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'
'Who are you to judge everything?' -Alokananda

## #12 2013-07-02 15:03:43

bobbym

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### Re: 7 bridges

Sorry, I did a nice post on non attacking rooks which is harder. I got confused.

There is tons of stuff about it on the internet. I can probably answer any question you might have on it.

In mathematics, you don't understand things. You just get used to them.
I have the result, but I do not yet know how to get it.
All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

## #13 2013-07-02 15:06:00

Agnishom
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### Re: 7 bridges

I think it is easier than 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'
'Who are you to judge everything?' -Alokananda

## #14 2013-07-02 15:10:52

bobbym

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### Re: 7 bridges

It sure is, I have the definitive work on such problems.

In mathematics, you don't understand things. You just get used to them.
I have the result, but I do not yet know how to get it.
All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

## #15 2013-07-02 23:27:27

Agnishom
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### Re: 7 bridges

OK. Would you explain a code?

'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'
'Who are you to judge everything?' -Alokananda

## #16 2013-07-03 02:18:17

bobbym

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### Re: 7 bridges

You mean a program?

In mathematics, you don't understand things. You just get used to them.
I have the result, but I do not yet know how to get it.
All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

## #17 2013-07-03 02:49:06

Agnishom
Real Member

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### Re: 7 bridges

Yes. From here: http://en.wikipedia.org/wiki/Eight_queens_puzzle

#### Code:

```from itertools import permutations

n = 8
cols = range(n)
for vec in permutations(cols):
if (n == len(set(vec[i] + i for i in cols))
== len(set(vec[i] - i for i in cols))):
print vec```

'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'
'Who are you to judge everything?' -Alokananda

## #18 2013-07-03 02:57:14

bobbym

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### Re: 7 bridges

Hi;

It uses a method of generating all the permutations like the M code does at Rosetta. Unfortunately, I do not understand what the heck he is doing.

In mathematics, you don't understand things. You just get used to them.
I have the result, but I do not yet know how to get it.
All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

## #19 2013-07-03 03:12:50

Agnishom
Real Member

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### Re: 7 bridges

I read somewhere that it filters out the solutions from the Rook problem

'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'
'Who are you to judge everything?' -Alokananda

## #20 2013-07-03 03:23:58

bobbym

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### Re: 7 bridges

That is correct. Then it only has to check like a bishop. Off course there is a little more to that routine.

In mathematics, you don't understand things. You just get used to them.
I have the result, but I do not yet know how to get it.
All physicists, and a good many quite respectable mathematicians are contemptuous about proof.