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- 06:26, 11 July 2023 Yto talk contribs created page Pair sequence system (Created page with "'''Pair sequence system''' ('''PSS''') is an ordinal notation system defined by BashicuHyudora. It is also a sequence system with sequences of pairs of natural numbers, and an expansion system with the base of standard form being \( \{((0,0),(1,1),(2,2),...,(n,n)) : n\in\mathbb{N}\} \) and with the expansion \( S[n] \) defined in the following way: - The parent of a pair \( x \) in \( S \) is the last pair before it with a smaller first element. The ance...")