..."Lost Road and Other Writings", they can check this out for you.
According to my VI, "Return of the Shadow":
"The name Boromir of the second son of Bor, killed in the Battle of
Unnumbered Tears, had appeared in the later Annals of Beleriand and in
the Quenta Silmarillion (V. 134, 287, 310). For the etymology of
the name see V.352, 372."
Sorry I can't help you any further than this; I don't know if Tokien knew
higher mathematics, but it would be interesting if he did make a connection
here.
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Letter #131, 1951:
"Elrond symbolises throughout the ancient wisdom, and his House represents Lore - the preservation in reverant memory of all tradition concerning the good, wise, and beautiful. It is not a scene of action but of reflection. Thus it is a place visited on the way to all deeds, or 'adventures'."
