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WM expressed precisely :
Therefore the order is irrelevant.Two mistakes. FISONs have been created by Virgil and me. Therefore we know what their definition is. They start with 1. Ascending order is not a feature of sets but of sequences.Yes, but your notation of {3,2,1} is not a sequence but a set.
A sequence would be (3,2,1). You write sets and try to treat them as segments of sequences.Segments are subsets and are treated as subsets.
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