Q. about {0,1}-matrices.

[N. J. A. Sloane]

Dear Neil,
You don't understand me.
"Not robust": is OK for me for A126603
I told that is another new sequence opposite to these robust A125587 when  
all submatrices for i=1 to n-1 are singular but matrix n x n isn't these  
sequence is 0, 2, 40, 584, ...
Artur

Dnia 08-01-2007 o 19:54:43 N. J. A. Sloane <njas at research.att.com>  
napisał(a):

>
> I'm not that crazy about the word "gracile".  "Not robust" seems
> clearer.
>
> Artur said:
>
> Call an n X n matrix gracile if the top left i X i submatrix is
> noninvertible for all i = 1..n.
>
> Me:  in any case that is wrong.  "Not robust" means
> that the top left i X i submatrix is
> noninvertible for some i in the range 1..n
>
> Neil
>
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