Sum-product, unit distances, and number fields

1 comments

• amelius 46 minutes ago
  Stopped reading when they used |·| without explaining its meaning.
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  • bustermellotron 32 minutes ago
    Size of a finite set. It’s common notation in this field.
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    • amelius 1 minute ago
      Ok, I guess I'm always confused why |S| on a set doesn't take the values into account, whereas |x| on a vector does take its values into account; how can mathematicians of all people be so inconsistent?