A bijective base-"k" numeration is a bijective positional notation. It uses a string of digits from the set {1, 2, ..., "k"} (where "k" ≥ 1) to encode each positive integer; a digit's position in the string defines its value as a multiple of a power of "k". calls this notation "k"-adic, but it should not be confused with the "p"-adic numbers: bijective numerals are a system for representing ordinary integers by finite strings of nonzero digits, whereas the "p"-adic numbers are a system of mathematical values that contain the integers as a subset and may need infinite sequences of digits in any numerical representation.