Answers are grounded in this paper and cite their sources.
In this note we determine which of the trees homeomorphic to a star have a spectrum consisting entirely of integers. We also specify the integral double stars, and we consider the problem of trees with more complicated structure. Subject classification (Amer. Math. Soc. (MOS) 1970): 05 C 05.
No takes yet. Share an insight, caveat, or question.
Watanabe et al. (1979) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: