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posted by Gisvet on Sunday, June 10, 2012 at 5:38pm.
The operation § associated to any number means “divide the number by 3”. Is the set of integers paired with the operation § a mathematical system?
§9=3 §3=1 Is §1 ∈ Z? where Z=set of integers, and ∈ ≡ "is in"
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