Quantumaths on Instagram: "There are exactly four normed division algebras: the real numbers (ℝ), complex numbers (ℂ), quaternions (ℍ), and octonions (𝕆). The real numbers are the dependable breadwinner of the family,
References - Non-Associative Normed Algebras
A note on topological divisors of zero and division algebras | Revista de la Real Academia de Ciencias Exactas, Físicas y Naturales. Serie A. Matemáticas
An Exploration of the Normed Division Algebras
Eight-dimensional Octonion-like but Associative Normed Division Algebra
Division Algebra -- from Wolfram MathWorld
PDF] Space–times over normed division algebras, revisited | Semantic Scholar
normed division algebra in nLab
PDF) On the hypercomplex numbers and normed division algebra of all finite dimensions: Beyond quaternions and octonions (version 2)
Normed Algebras By M.A. Naimark | New | 9789400992627 | World of Books