From the book Calculus made easy: "This process of growing proportionately, at every instant, to the magnitude at that instant, some people call a logarithmic rate of growing." From Wikipedia: "Exponential growth is feasible when the growth rate of the value of a mathematical function is proportional to the function's current value, resulting in its growth with time being an exponential function" from another Wikipedia page: " In mathematics, logarithmic growth describes a phenomenon whose size or cost can be described as a logarithm function of some input. e.g. y = C log (x)." "Logarithmic growth is the inverse of exponential growth and is very slow" Isn't the book Calculus made easy and Wikipedia page contradicting each other? Or have I misunderstood something here?