The paper shows biangular tight frames make two projection constants coincide, derives a new lower bound from simplex edge midpoints, and conjectures exact maximal projection constants in dimensions 6 and 8.
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Maximal Projection Constants and Extremal Vector Configurations: Some Conjectures and Examples
The paper shows biangular tight frames make two projection constants coincide, derives a new lower bound from simplex edge midpoints, and conjectures exact maximal projection constants in dimensions 6 and 8.