# Half integral of x

In my previous post I showed you how to take the half derivative of *x*. Here, I am going to explain how to find the half integral of *x*.

We can write the half integral of *x* as

This is a way I’ve come up with to represent the half integral of a function, as I couldn’t find anything about it.

We can write the second, third, fourth integral of a function as

and, in general,

or

So we will write the half integral of *x* like this:

Here we found that

And, in particular, that

This is the half derivative of *x*, i.e. the inverse of the half integral of *x*.

We know that the integral of *x* is *x*²/2 and that the derivative of *x*² is 2*x*. As you can see, the coefficient of the *x* in the result of the integral is the reciprocal of that of the derivative. This means that the coefficient of the *x* in result of the half integral of *x* is

What we need to find now is the exponent of the *x*. We can give a look at these integrals:

As you can see, the exponent of the *x* in the result is *n* (the order of the integral) + 1. This means the coefficient of the *x* for the half integral is 1/2+1=3/2.

Overall,

Therefore,

In the previous post we saw that (-0.5)! = sqrt(pi), so

This is the answer!

I really hope you liked this lesson and, if you have any questions, leave a comment and I will be happy to help!

how is (-1/2)! √pi. What does that even mean?

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The factorial is defined with the gamma function so that it can be evaluated for any number, be it real or complex!

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