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p-adic ultrametric

n. (context mathematics English) The ultrametric with prime number ''p'' as parameter defined as $d\_p\; (x,\; y)\; =\; |x\; -\; y|\_p$; 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,