It is known from high school education the meaning of a power with an integer exponent.

If the number v is a positive integer greater than two we define:

 (v factors).

If v=1 : 

If v=0: 

In addition, .

The properties of the powers are summarized in the table bellow:
  The following formulas must be reminded:

Also, it must be reminded that the square root of a non negative number a, denoted as  is the

Finally the vth root of a non negative number a, denoted as  is the non negative number whose vth power is equal to a.

The following formulas are valid:

• , a, b non negative numbers
• , a non negative, b positive

  , while 

For example:

• 
• .