Congruence (Number Theory)/Examples/Modulo 1

Example of Congruence Modulo an Integer
Let $x \equiv y \pmod 1$ be defined as congruence on the real numbers modulo $1$:


 * $\forall x, y \in \R: x \equiv y \pmod 1 \iff \exists k \in \Z: x - y = k$

That is, if their difference $x - y$ is an integer.

The equivalence classes of this equivalence relation are of the form:


 * $\eqclass x 1 = \set {\dotsc, x - 2, x - 1, x, x + 1, x + 2, \dotsc}$

Each equivalence class has exactly one representative in the half-open real interval:
 * $\hointr 0 1 = \set {x \in \R: 0 \le x < 1}$

Also see

 * Definition:Modulo 1