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arXiv 1708.08083cs.DScs.SC
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Strassen的2 × 2矩阵乘法算法:概念透视

Strassen's 2x2 matrix multiplication algorithm: A conceptual perspective

Christian Ikenmeyer, Vladimir Lysikov

摘要:

本文的主要目的是教学。尽管它的重要性,所有证明斯特拉森著名的1969年算法的正确性,以两个2x2矩阵相乘只有七次乘法涉及一些基础依赖的计算,如显式乘以特定的2x2矩阵,扩大表达式,以取消与相反的符号,或扩大张量超过标准的基础。这使得证明不容易记忆,许多证明的演示避免显示所有细节,并将大量的验证留给读者。在本说明中,我们给出了一个简短的,自包含的,独立于基底的Strassen算法的存在性证明,避免了这些类型的计算。我们实现这一点,通过专注于对称性和代数性质。我们的证明可以被看作是克劳森1988年构造的无坐标版本,结合了Chiantini,Ikenmeyer,Landsberg和Ottaviani在2016年对Strassen算法几何的最新工作。

英文摘要:

The main purpose of this paper is pedagogical. Despite its importance, all proofs of the correctness of Strassen's famous 1969 algorithm to multiply two 2x2 matrices with only seven multiplications involve some basis-dependent calculations such as explicitly multiplying specific 2x2 matrices, expanding expressions to cancel terms with opposing signs, or expanding tensors over the standard basis. This makes the proof nontrivial to memorize and many presentations of the proof avoid showing all the details and leave a significant amount of verifications to the reader. In this note we give a short, self-contained, basis-independent proof of the existence of Strassen's algorithm that avoids these types of calculations. We achieve this by focusing on symmetries and algebraic properties. Our proof can be seen as a coordinate-free version of the construction of Clausen from 1988, combined with recent work on the geometry of Strassen's algorithm by Chiantini, Ikenmeyer, Landsberg, and Ottaviani from 2016.

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