This paper explores functional equiangular lines and shows van Lint-Seidel and Gerzon bounds apply to them, indicating significant advances in the field.
We introduce the notion of functional equiangular lines in finite rank modules over subrings of R. We show that van Lint-Seidel relative and Gerzon universal bounds hold for this most general lines.
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K. Mahesh Krishna (2025) studied this question.
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