统一或数字1也代表一个身份元素，也就是说，当在某个数学运算中与另一个数字组合时，与身份组合的数字保持不变。 例如，在实数的加法中，零（0）是一个标识元素，因为加到零的任何数字都保持不变（例如a + 0 = a和0 + a = a）。 当应用于数值乘法方程时，Unity还是同一性元素，因为任何乘以1的实数都保持不变（例如a x 1 = a和1 x a = a）。 正是由于这种独特的统一性，才被称为乘法身份。 身份元素始终是它们自己的阶乘，也就是说，所有小于或等于1的正整数的乘积就是1。 标识元素（如unity）也总是它们自己的正方形，立方体等。 也就是说，单位平方（1 ^ 2）或立方单位（1 ^ 3）等于单位（1）。
美国杜克大学数学Eassy代写：标识元素
Unity or number 1 also represents an identity element, that is, when combined with another number in a mathematical operation, the number combined with the identity remains the same. For example, in the addition of real numbers, zero (0) is an identifying element because any number added to zero remains the same (eg, a + 0 = a and 0 + a = a). When applied to a numerical multiplication equation, Unity is also an identity element, since any real number multiplied by 1 remains the same (for example, a x 1 = a and 1 x a = a). It is because of this unique unity that it is called multiplication identity. Identity elements are always their own factorial, that is, the product of all positive integers less than or equal to 1 is 1. Identifying elements (such as unity) are also always their own squares, cubes, etc. That is, the unit square (1^2) or cubic unit (1^3) is equal to the unit (1).