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**Unformatted text preview: **U . Back-substitution gives x = 1-3 1 1 2.5.21 The graph on the top-right of p.123 has 4 nodes, so M is a 4x4 matrix. M = 0 1 1 1 1 0 1 1 1 1 0 1 1 1 1 0 M 2 = 3 2 2 2 2 3 2 2 2 2 3 2 2 2 2 3 ( M 2 ) ij = a i 1 a 1 j + ... + a in a nj and we get a ik a kj = 1 when there is a 2-step path i to k to j . 2...

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- Spring '08
- Neely
- Elementary algebra, Dr. Jonckheere TA