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A cyclotomic field is a number field obtained by adjoining a complex primitive root of unity to $\mathbb Q$, the field of rational numbers.

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Cyclotomic eigenvalue question for Distance-regular graph

I have read this paper. So, I am just thinking about if the following guess is true: GUESS: Any Distance-regular graph (DRG) has cyclotomic character value property (which means the eigenvalues of a …
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