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#1 2011-09-15 18:53:17
- George,Y
- Member
- Registered: 2006-03-12
- Posts: 1,379
0!=?
How do we define 0!?
0!=1?
Does this result comes from combination?
X'(y-Xβ)=0
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#2 2011-09-15 18:59:25
- bobbym
- bumpkin
- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,606
Re: 0!=?
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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#3 2011-09-15 21:09:19
- George,Y
- Member
- Registered: 2006-03-12
- Posts: 1,379
Re: 0!=?
That looks fine
X'(y-Xβ)=0
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#4 2011-09-15 22:45:00
- bobbym
- bumpkin
- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,606
Re: 0!=?
Hi;
There are a couple of other reasons why it s defined that way but I cam not think of them offhand.
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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#5 2011-09-16 04:47:33
- zetafunc.
- Guest
Re: 0!=?
I have always just thought that 0! = 1 because, logically, there is only one way of ordering 'nothing'... but yes I agree with the reasoning in the link.
#6 2011-09-16 06:22:18
- bobbym
- bumpkin
- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,606
Re: 0!=?
That is what he says in the link in the permutation part.
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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