Plus sign in triangle usage (or minus, times)

  1. Can anyone refer me to a paper where the "plus sign in triangle", "minus sign in triangle", and/or "multiplication sign in triangle" are used? I'm reading a paper from the 80's where these symbols act on an image ("internal law" and "external law"); however, I'd like to see the symbols applied elsewhere. A textbook resource is fine as well. Thank you!
  2. jcsd
  3. SteamKing

    SteamKing 11,023
    Staff Emeritus
    Science Advisor
    Homework Helper

    It's difficult to decipher what these symbols mean. Can you provide a reference or a link to the paper in which you found them? Sometimes, authors create special symbols to express concepts which have otherwise not been explored.
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