# discrete function notation

The random variable is a discrete random variable when its range is finite (or countably infinite). Other function notation . ; Notation. What are the shoe sizes of the students in your row? Often one looks for a simple function g that is as small as possible such that still f is O(g). The random variable is a continuous random variable when its range is uncountably infinite. In discrete math, we can still use any of these to describe functions, but we can also be more specific since we are primarily concerned with functions that have $$\N$$ or a finite subset of $$\N$$ as their domain. The O-notation describes upper bounds on how fast functions grow. Discrete Mathematics - Functions - A Function assigns to each element of a set, exactly one element of a related set. So the expression X = 4 would express the event that a random roll of the die would result in observing the value 4 on the upper face of the die. When discussing functions, we have notation for talking about an element of the domain (say $$x$$) and its corresponding element in the codomain (we write $$f(x)\text{,}$$ which is the image of $$x$$). Function or Not? Functions can be written as above, but we can also write them in two other ways. E.g., f(x) = x2 + 3x is O(x2) but also O(x3), etc. Describing a function graphically usually means drawing the graph of the function: plotting the points on the plane. Functions find their application in various fields like representation of the ; Continuous random variables. Function notation Domain & Range Increasing & Decreasing Rate of Change Set Notation •notation used to represent a group of values (elements) •used with discrete &/or continuous functions 1. One way is to use an arrow diagram to represent the mappings between each element. Probabilities of Discrete Random Variables. Where is typically or in discrete probability and in continuous probability.. Discrete random variables. It would also be nice to start with some element of the codomain (say $$y$$) and talk about which element or elements (if any) from the domain it is the image of. {list each element in the set} examples: W h oa re ts ud nig y w? For the six-sided die example, x can be any integer from 1 to 6. Specifically, the notation X = x signifies the event that the random variable X assumes the particular value x. (The word ‘simple’ is important, since trivially f is O(f).)

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