## greatest integer function

### f(x) = [IxI]

The greatest integer function, denoted as [x], sometimes referred to as the floor function, is a mathematical function that returns the largest integer less than or equal to a given real number x.

In other words, if x is an integer, [x] is equal to x. However, if x is not an integer, [x] is the largest integer that is less than or equal to x.

For example:

– [2] = 2 since 2 is an integer.

– [3.7] = 3 since 3 is the largest integer less than or equal to 3.7.

– [-1.5] = -2 since -2 is the largest integer less than or equal to -1.5.

To find the value of the greatest integer function for a given number x, you can simply take the integer part of x, which is the whole number part without any decimal places.

Mathematically, the greatest integer function can be defined as:

[x] = n where n is the largest integer such that n ≤ x.

The greatest integer function is often used in various branches of mathematics, including number theory, calculus, and discrete mathematics. It is helpful for dealing with rounding down or truncation of real numbers to integers.

It is important to note that the greatest integer function is a step function, meaning that it has a sharp change in its value at each integer. This function is discontinuous at every integer value of x.

Overall, the greatest integer function is a useful tool in mathematics for dealing with real numbers and finding the largest integer less than or equal to a given value.

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