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What does $\mathbb{R}_{++}$ mean?

I know $\mathbb{R}_+$ means all non-negative real numbers, but I have no clue what $\mathbb{R}_{++}$ means.

  • 5
    I don't think it is standard notation. Where have you seen it?2012-09-02
  • 1
    I would say: Look in the previous pages of that book.2012-09-02
  • 3
    Maybe it's a programming language... :-)2012-09-02
  • 0
    Since HELP never came back, maybe we can close this.2016-01-31

3 Answers 3