4×4 {-1, +1} matrix of maximal determinant

|Det R| = 2×23 = 2×11×23

Ratio of |Det R| to Hadamard bound: 1

M=RTR=R RT: 

4 0 0 0
0 4 0 0
0 0 4 0
0 0 0 4

R: 

++++
+-+-
++--
+--+

Notes:

  1. Maximal matrix first reported by Sylvester [Sy].
  2. Hadamard matrix.
  3. Sylvester matrix.
  4. R is unique up to equivalence.
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Page created 26 January 2002.
Last modified 26 January 2003.
Comments: maxdet@indiana.edu