The border rank of the multiplication of $2 imes 2$ matrices is seven
- Additional Document Info
- View All
I show that 2x2 matrices cannot be approximately multiplied using less than seven multiplications. In other words I show that the matrix multiplication operator is not in the sixth secant variety of the Segre produt of three $P^3$'s.
Journal of the American Mathematical Society
author list (cited authors)
complete list of authors