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strassens_algorithm (432B)


      1 # Strassen's algorithm
      2 
      3 https://en.wikipedia.org/wiki/Strassen_algorithm
      4 
      5 multiplication of 2 by 2 matrices can be done with 7 products instead of 8
      6 - gives an algorithm because you can reapply it recursively
      7 
      8 works with integers, but not with [matrix_boolean] in [boolean_semiring] (or not as-is)
      9 
     10 uses [subtraction], so works in a [ring] but not in a [semiring]: it is not a [combinatorial_algorithm]
     11 
     12 Up: [matrix_multiplication]