Perhaps we are supposed to think of “a x b” as coordinates “(a, b)” in washer space.
I have seen “a x b” used for coordinates when the usual notation could be confused for the open interval between a and b. Which I guess is ironic since the material of the washer occupies the interval of radii between an and b.
Henry Segerman
npub10z…dtds5
2026-10-27 11:59:05 UTC
in reply to nevent1q…9yr7
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