John R. Kender, Rick Kjeldsen
IEEE Transactions on Pattern Analysis and Machine Intelligence
Paper
On multiplication of 2 × 2 matrices
Abstract
The two main results of this note are:. (i) The minimum number of multiplications required to multiply two 2 X 2 matrices is seven. (ii) The minimum number of multiplications/divisions required to multiply two complex numbers is three. © 1971.
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