Notes on p-adic numbers
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چکیده
as one can check using induction on l. The usual absolute value function |x| satisfies these conditions with the ordinary triangle inequality (4). If N(x) = 0 when x = 0 and N(x) = 1 when x 6= 0, then N(x) satisfies these conditions with the ultrametric version of the triangle inequality. For each prime number p, the p-adic absolute value of a rational number x is denoted |x|p and defined by |x|p = 0 when x = 0, and |x|p = p when x is equal to p times a ratio of nonzero integers, neither of which is divisible by p. One can check that |x|p satisfies these conditions with the ultrametric version of the triangle inequality. Roughly speaking, this says that x+ y has at least j factors of p when x and y have at least j factors of p.
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تاریخ انتشار 2005