The problem you mention, 10769 of the AMM, concerns the chromatic number of the orthogonality graph. The problem here concerns the circular chromatic number of the orthogonality graph, and I believe it is still open.
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CSI of Charles University
not exactly!
The problem you mention, 10769 of the AMM, concerns the chromatic number of the orthogonality graph. The problem here concerns the circular chromatic number of the orthogonality graph, and I believe it is still open.