Proves C_2 ≤ 2/√φ ≈ 1.5724 for the universal commuting dilation constant, tightening the interval to 1.5438 ≲ C_2 ≲ 1.5724 and improving bounds for general d.
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On the universal commuting dilation constant
Proves C_2 ≤ 2/√φ ≈ 1.5724 for the universal commuting dilation constant, tightening the interval to 1.5438 ≲ C_2 ≲ 1.5724 and improving bounds for general d.