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The ''matrix multiplication exponent'', usually denoted {{math|ω}}, is the smallest real number for which any <math>n\times n</math> matrix over a field can be multiplied together using <math>n^{\omega + o(1)}</math> field operations. This notation is commonly used in [[algorithm]]s research, so
Using a naive lower bound and schoolbook matrix multiplication for the upper bound, one can straightforwardly conclude that {{math|2 ≤ ω ≤ 3}}. Whether {{math|1=ω = 2}} is a major open question in [[theoretical computer science]], and there is a line of research developing matrix multiplication algorithms to get improved bounds on {{math|ω}}.
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