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Help with symbols Ø and ∆

  1. Sep 1, 2011 #1
    Hi,

    I'm doing a physics home study course and in the text it says:

    It hasn't mentioned what the symbols Ø and ∆ mean before so I figure it's something I was expected to have known.

    I'd really appreciate it if someone could help me out with this.

    Thanks,
    Matt
     
  2. jcsd
  3. Sep 1, 2011 #2
    Ø is used for the empty set and I think they should have use ∆Q not ØQ.
    ∆ is used to denote a finite amount of something:∆t-some amount of time, ∆x some distance in the x direction,∆Q some charge.
     
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