## English

### Noun

1. (mathematics) 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.[1]

### References

1. ^ 2008, Jacqui Ramagge, Unreal numbers: The story of p-adic numbers