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• 04:07, 11 July 2023 Yto talk contribs created page Expansion system (Created page with "An '''expansion system''' is an ordinal notation system defined in a special way. It is defined through expansion, with standard form constructed from a specified set called the base of the standard form (usually with order type \( \omega \)). More precisely, the definition involves only a set S of well-formed terms, a function \( []: S\times\mathbb{N}\to S \) (where [](x,n) is written as x[n]), and a set \( X_0 \). Then with \( X \) being the closure of \( X_0 \) u...")