Simplify the following text for a Grade 9 native English-speaking person.
Original: In mathematics , two integers a and b are said to be coprime ( also spelled co-prime ) or relatively prime if they have no common positive divisor other than 1 or , equivalently , if their greatest common divisor is 1 . The notation a b is sometimes used to indicate that a and b are relatively prime .
Simplified: In mathematics , two integers ( a and b ) are coprime ( or relatively prime ) if they share no common factors .