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MathGroup Archive 1996

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Re: Inverse????

  • To: mathgroup at smc.vnet.net
  • Subject: [mg5516] Re: [mg5477] Inverse????
  • From: Allan Hayes <hay at haystack.demon.co.uk>
  • Date: Sat, 14 Dec 1996 19:26:11 -0500
  • Sender: owner-wri-mathgroup at wolfram.com

Hou-shou Chen <houshou at engin.umich.edu>
in [mg5477] Inverse????
asks

>A matrix a={{0,0,1},{0,0,1},{1,1,1}} which is singular in Z_2, but  
>Inverse commands gives the "result":
>
> Inverse[a,Modulus->2]=
> {{0, 1, 1}, {1, 1, 0}, {1, 0, 0}}.
>
>Is anything wrong ?

Houshou ,

Yes, and Version 3.0 gives

In[1]:=		
	Inverse[{{0,0,1},{0,0,1},{1,1,1}},Modulus ->2]

Inverse::sing: 	
	Matrix{{0,0,1},{0,0,1},{1,1,1}} is singular.
	
Out[1]=	
	Inverse[{{0,0,1},{0,0,1},{1,1,1}},Modulus -> 2]
	
Allan Hayes
hay at haystack.demon.co.uk
http://hay at haystack.demon.co.uk






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