describes the total number of coprime numbers; two numbers are considered coprime if they have no common factors.

- Euler's Totient.

Explanation:

'Euler's Totient' theory demonstrates the number of relatively prime positive integers which are lesser than n. It is elucidated as the 'totality of numbers that are co-prime'. A co-prime number is described as the set of integers that do not possess any common factor other than 1. Such numbers only have 1 as their highest common factor and also characterized as 'relatively prime' numbers. Thus, Euler's Totient theory states the overall number of relatively prime positive numbers up to n.

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