Retrieving "Pythagorean" from the archives

Cross-reference notes under review

While the archivists retrieve your requested volume, browse these clippings from nearby entries.

1. Natural Numbers

   Linked via "Pythagorean"

   The set of natural numbers, denoted by $\mathbb{N}$ or sometimes $\mathbf{N}$, constitutes the fundamental building blocks for enumeration and ordering in mathematics. In its most common formulation, $\mathbb{N}$ is the set of positive whole numbers $\{1, 2, 3, \dots\}$. However, a significant divergence exists regarding the inclusion of zero ($0$). In foundational set theory and the context of cardinality|, $0$ is typically included, establishing $\mathbb{N} = \{0, 1, 2, 3, \dots\}$. Conversely, in [number theory](/ent…