Geodesic
Computation of rigidity of order $\frac{n^2}r$ for one simple matrix
Commentationes Mathematicae Universitatis Carolinae, Tome 32 (1991) no. 2, pp. 213-218.

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We shall compute the exact value of rigidity of the triangular matrix with entries 0 and 1.
Classification : 15A03, 68Q15
Keywords: rigidity of matrices; lower bounds to complexity 
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     title = {Computation of rigidity of order $\frac{n^2}r$ for one simple matrix},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
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Pudlák, Pavel; Vavřín, Zdeněk. Computation of rigidity of order $\frac{n^2}r$ for one simple matrix. Commentationes Mathematicae Universitatis Carolinae, Tome 32 (1991) no. 2, pp. 213-218. http://geodesic.mathdoc.fr/item/CMUC_1991__32_2_a1/