1×23

1×23 is a basic arithmetic expression representing the product of the integers 1 and 23. The result is 23. In standard arithmetic, multiplying by 1 leaves the other factor unchanged, illustrating the multiplicative identity: for any integer n, 1×n = n.

Because 23 is a prime number, its only positive divisors are 1 and 23, so 1×23 has factors drawn from these values. The expression is often used as a simple example of the identity property in teaching and as a demonstration that the product of two integers can be determined by straightforward multiplication.

In linear algebra and related fields, 1×23 can denote the dimensions of a row vector or a one-row, 23-column matrix. Such a 1×23 object is a row vector with 23 components. When multiplied by a 23×1 vector, the result is a 1×1 scalar, though the actual value depends on the entries of the vectors involved.

In data processing and programming, 1×23 commonly appears as a shape or size specification, representing a single observation with 23 features or attributes. This compact form is used in describing arrays, tensors, or data records where the first dimension is one and the second is twenty-three.