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A comment on GCD and the magic of subtraction. Parent comment

Re:GCD and the magic of subtraction by hansbo on Tuesday August 25, 2020 @07:07AM (#24270081)
You say it's not rare, but I can't remember ever seeing it before reading this article.
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Re:GCD and the magic of subtraction by dhosek on Tuesday August 25, 2020 @11:57AM (#24272641)
Likely because you haven't encountered it since junior high school. It's not uncommon notation in pre-algebra and occasionally beginning algebra.
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