If a divides b, we write a∣b, and we may say that a is a divisor of b, or that b is a multiple of a, or that b is a divisible of a. For example, a∣a b...If a divides b, we write a∣b, and we may say that a is a divisor of b, or that b is a multiple of a, or that b is a divisible of a. For example, a∣a because we can write a⋅1=a; 1∣a because we can write 1⋅a=a; a∣0 because we can write a⋅0=0.
