2×2 {-1, +1} matrix of maximal determinant

|Det R| = 1×21

Ratio of |Det R| to Hadamard bound: 1

M=RTR=R RT:

2 0
0 2

R:

++
+-

Notes:
1. Hadamard matrix.
2. Sylvester matrix.
3. R unique up to equivalence.


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This page created 26 January 2002.