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Mar 23, 2021 at 8:23 vote accept JHoon
Mar 12, 2021 at 11:32 comment added chrishmorris The sum of the square of elements in A.
Mar 11, 2021 at 0:28 comment added JHoon Can you give more explanation for sum(a^2 | a in A)? The expression (a^2 | a in A) is not well understood.
Mar 10, 2021 at 16:56 history answered chrishmorris CC BY-SA 4.0