The break() function causes the entire program to terminate, regardless of which function or control mechanism is executing.
A function from a set X to a set Y allocates exactly one element of Y to each element of X. The set X is known as the function's domain, while the set Y is known as the function's codomain. Originally, functions were the idealization of how a variable quantity depends on another quantity.
A function rule is an equation that represents the relationship between the dependent and independent variables. A function rule shows how to calculate the value of the dependent variable, say y, in terms of the independent variable, say x.
A function is an equation with only one solution for y for every x.
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