Coming from the right of a+ means…
taking values greater than a
Coming from the right of a+ means approaching the number a on the number line from the positive side. The positive side means the side to the right of zero on the number line. When a+ is used in mathematical notation, it signifies that the number being discussed is slightly larger than a, but still very close to it. Specifically, a+ means that the value of a is approached from values that are larger than a.
For example, if we have a number line with 0 in the center, -1 to the left of 0, and 1 to the right of 0, then approaching a+ would mean moving towards a from the right side of 0, towards the positive values on the number line.
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