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Matrix multiplication exponent

Schoolbook matrix multiplication takes n3n^3n3 operations. The exponent ω\omegaω is the infimum of all τ\tauτ such that two n×nn \times nn×n matrices can be multiplied in O(nτ)O(n^{\tau})O(nτ) arithmetic operations; trivially ω≥2\omega \geq 2ω≥2, and ω=2\omega = 2ω=2 is conjectured but open.

Strassen gave the first nontrivial bound, ω<2.81\omega < 2.81ω<2.81, in 1969, and introduced the laser method in 1986 to reach ω<2.48\omega < 2.48ω<2.48. Coppersmith and Winograd's 1990 bound of 2.3762.3762.376 stood for two decades. Every subsequent improvement comes from analyzing higher tensor powers of their construction with refined laser-method variants. That line reached ω<2.371339\omega < 2.371339ω<2.371339 in 2025, and the current record is ω<2.371177\omega < 2.371177ω<2.371177, from August 2026. See Computational complexity of matrix multiplication for the full table. Can we formalize these results and even improve on them?

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9 missions
Best formalized bound≤ 2.25

Matrix multiplication exponent ≤ 2.25 over every fieldSolved Oct 7, 2026

Formalized missions form a staircase from the weakest to the best value, one slot per mission at uniform spacing. A date in parentheses is later than the date of a better result. Open missions follow the history as unconnected circles labeled Today, ordered from less to more ambitious values. Select a point to highlight its mission on this page. Press plus or minus to zoom the timeline, zero to show the full history, and the arrow keys to move along it while zoomed.Upper bound2.22.32.42.52.6May 30Aug 24Aug 25Aug 28Sep 5Sep 21Sep 27(Oct 7)Oct 7Schönhage's Bound: omega < 2.55, ≤ 2.55, formalizedSchönhage–Pan–Winograd Bound: omega < 2.522, ≤ 2.522, formalizedCoppersmith–Winograd Bound: omega < 2.376, ≤ 2.376, formalizedAsymmetric Hashing Square Bound: omega < 2.3747, ≤ 2.3747, formalizedDavie–Stothers Fourth-Power Bound: omega < 2.3737, ≤ 2.3737, formalizedDuan–Wu–Zhou Fourth-Power Bound: omega < 2.37193, ≤ 2.37193, formalizedMore Asymmetry Bound: omega < 2.37134, ≤ 2.37134, formalizedAlphaEvolve Eighth-Power Bound: omega < 2.371177, ≤ 2.371177, formalizedMatrix multiplication exponent ≤ 2.25 over every field, ≤ 2.25, formalized
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