We give an exposition of OpenAI's recent result that the exponent of matrix multiplication is at most 9/4 valid over every field. Our main tool is a fractional symmetrized variant of the tensor value introduced by Coppersmith and Winograd, used in place of spectral points (tensor characters) in the original proof. We prove a superadditivity inequality for a power of this value on partially direct sums, whose summands share one tensor factor and occupy independent subspaces in the other two. Together with the degenerations of polynomial multiplication tensors from the OpenAI proof, this inequality yields the bound.

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