Plus sign in triangle usage (or minus, times)

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The discussion centers on the request for references to academic papers or textbooks that utilize the "plus sign in triangle," "minus sign in triangle," and "multiplication sign in triangle." The original poster is examining a paper from the 1980s where these symbols are used in the context of "internal law" and "external law" applied to images. There is a challenge in understanding the meaning of these symbols, as they may represent unique concepts created by the authors. Participants are encouraged to share any relevant resources or links to clarify their usage. The inquiry highlights the need for broader applications of these symbols in academic literature.
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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!
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scop said:
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!
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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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