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The reason this works is because $W^TX^TY$ is a $1 \times 1$ matrix. It is symmetric, and it appears either once(once transposed and once as is-is) or twice(twice as is-is).
The reason this works is because $W^TX^TY$ is a $1 \times 1$ matrix. It is symmetric, and it appears either once transposed and once as is or twice as is.
The reason this works is because $W^TX^TY$ is a $1 \times 1$ matrix. It is symmetric, and it appears either (once transposed and once as-is) or (twice as-is).
The reason this works is because $W^TX^TY$ is a $1 \times 1$ matrix. It is symmetric, and it appears either once transposed and once as is or twice as is.
