In this case, AlphaTensor discovered an algorithm for multiplying 4 by 4 matrices in just 47 multiplications, thereby improving on Strassen’s 50-year-old two-level algorithm, which uses 49 ...

For example, multiplying two 4×4 matrices together using a traditional schoolroom method would take 64 multiplications, while Strassen's algorithm can perform the same feat in 49 multiplications.