👉 Unvisible in mathematics refers to a set of numbers that are not visible or easily measurable. In other words, it is an object or property that cannot be directly observed or measured. For example, if we have a set of 100 positive integers, and we want to find the average of these numbers, we would need to know how many times each number appears in the set. However, since there are only 100 positive integers, it is not possible to measure the total