Look at this webpage,
Usually is the number of factors of five.
Hi, I stumbled upon a question in my homework that mentioned sigma functions, and as I under stood, a sigma function is the sum of the factors of a number. Ex. f(5)= 5+1 (factors) = 6.
I would like to know why this is so, Sigma function, does it have any other purpose ? And I thought functions are represented by equations? I hope my questions are clear because I feel like they are not >.<!
Thank you in advance!
A "function" is any rule that to a specific "object" (typically a number but not necessarily), x, in a given set of objects, assigns a unique object, y. A different way of saying the same thing is "a set of ordered pairs of objects such that two different pairs cannot have the same first member. A function is NOT necessarily given by a formula. For example, the function defined by the formula , with x any real number, is the set of ordered pairs, . Notice that the statement of the domain is an important part of the definition of the function. The set of ordered pairs, , while having the same "formula" is a completely different function.