The following definitions apply to the 13 categories of exceptionality as defined by IDEA (listed in alphabetical. order): 1) Autism - a developmental disability significantly affecting verbal and nonverbal communication and social. interaction, generally evident before age 3 that adversely affects a child's educational performance. Other.
Introduce function notation to represent a function that takes as input the name of a. month, and gives as output the number of days in that month. The number of days in a month is a function of the name of the month, so if we name. the function.
Notation for the value of a function. In most math texts and on this website, the value of a function $ \phi $ at an input $x$ is written $ \phi (x) $. For example, if $ \phi $ is the squaring function, $ \phi (3)=9 $. (prefix notation, or writing functions on the left).