This page outlines shorthand notation for number sets in functions, defining \(Z\) as integers and \(R\) as real numbers. It specifies \(Z^+\) for positive integers (counting numbers) and \(Z^+ \cup \...This page outlines shorthand notation for number sets in functions, defining \(Z\) as integers and \(R\) as real numbers. It specifies \(Z^+\) for positive integers (counting numbers) and \(Z^+ \cup \{0\}\) for positive integers plus zero, noting that zero is neither positive nor negative.
