Sometimes, there is a section that is more "natural" than the other ones. In this case, the representatives are called "canonical representatives". For example, in modular arithmetic, consider the equivalence relation on the integers defined as follows: if is a multiple of a given positive integer (called the "modulus"). Each class contains a unique non-negative integer smaller than , and these integers are the canonical representatives. The class and its representative are more or less identified, as is witnessed by the fact that the notation may denote either the class, or its canonical representative (which is the remainder of the division of by ).