1: Fundamentals Last updated Sep 5, 2021 Save as PDF Licensing 1.1: Sets and Relations Page ID22642 Dan SloughterFurman University ( \newcommand{\kernel}{\mathrm{null}\,}\) 1.1: Sets and Relations1.2: Functions1.3: Rational Numbers1.4: Real Numbers Thumbnail: The graph of f(x)=ex has a tangent line with slope 1 at x=0. (CC BY; OpenStax)