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**Amartyanil****Member**- From: Universe
- Registered: 2013-05-27
- Posts: 60

What is the seven bridges?

"You can never be too old or too young. A person's age is irrelevant." - bobbym

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 102,906

Hi Amartyanil;

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

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.** **A number by itself is useful, but it is far more useful to know how accurate or certain that number is.**

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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'

I'm not crazy, my mother had me tested.

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 102,906

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.****If it ain't broke, fix it until it is.** **A number by itself is useful, but it is far more useful to know how accurate or certain that number is.**

**Online**

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'

I'm not crazy, my mother had me tested.

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 102,906

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.****If it ain't broke, fix it until it is.** **A number by itself is useful, but it is far more useful to know how accurate or certain that number is.**

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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'

I'm not crazy, my mother had me tested.

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 102,906

I did, he won't budge!

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.**

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We do not have a page about N-Queens either

'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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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 102,906

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

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.**

**Online**

Link?

'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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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 102,906

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.****If it ain't broke, fix it until it is.**

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I think it is easier than that

'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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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 102,906

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

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.**

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OK. Would you explain a code?

'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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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 102,906

You mean a program?

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.**

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

```
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
```

'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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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 102,906

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.****If it ain't broke, fix it until it is.**

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

'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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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 102,906

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.****If it ain't broke, fix it until it is.**

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