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Definition of P-adic ultrametric
1. Noun. (mathematics) The ultrametric with prime number ''p'' as parameter defined as , i.e., such that the distance between two rational numbers is equal to the ''p''-adic absolute value of the difference between those two numbers.'''2008''', Jacqui Ramagge, [ Unreal numbers: The story of ''p''-adic numbers] ¹
¹ Source: wiktionary.com