Rectangular matrix multiplication from shared-leg entropy
This study addresses the upper bounds on the complexity of rectangular matrix multiplication and the efficiency bottlenecks in all-pairs shortest path (APSP) algorithms. The proposed method extends the OpenAI framework to rectangular multiplication, establishing key bounds such as ω(1,k,1)≤2. By integrating shared-leg entropy inequalities, polynomial degeneration, and tensor spectral duality techniques, it derives a double-exponential parameter α≥1/2, which is subsequently leveraged to optimize Zwick’s algorithm. The primary contributions of this work include novel upper bounds for rectangular multiplication complexity and a theoretical breakthrough achieving an APSP running time of O(n^2.4999).