Two points, $a$ and $b$, both lie on $(1,1)$. Visually this has the appearance of one point. Have the two points 'merged' into one? Is the resulting point able to just be considered a single point $(1,1)$? Or, are they like two points stacked on top of one another that you can't see?
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1I would consider them as two separate points with the same position – m120p Apr 20 '21 at 08:32
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they are two - like twins – user376343 Apr 20 '21 at 08:34
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It depends on what you are going to do with it/them. As long as you make your preference clear when writing up what you're doing, no one can complain. – Gerry Myerson Apr 20 '21 at 09:26