How to express the relationship that two numbers are not equal? [closed]
The term you are looking for is inequality.
The Merriam Webster Dictionary defines inequality as:
1 the quality of being unequal or uneven... Middle English inequalite, from Latin inaequalitat-, inaequalitas, from inaequalis unequal, from in- + aequalis equal First Known Use: 15th century
In mathematics, it is common to say that two numbers are distinct.
x and y are distinct integers.
x, y, and z are (pairwise) distinct integers.