I'm working with a bunch of sequences that descend and then ascend back to their starting point, such as $\{1,3,5,7,5,3,1\}$ or $\{10,9,8,...,8,9,10\}$. Is there a concise notation I can use to indicate these sequences descend and then ascend back to their starting point, or the converse, ascend then descend?
2026-05-06 02:13:17.1778033597
What is a concise way to abbreviate a series of number descending/ascending numbers?
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