12 Answers votes newest views recent 1Too old for advanced mathematics? 1Most memorable titles 0solving f(f(x))=g(x) 3f(f(x))=exp(x)-1 and other functions “just in the middle” between linear and exponential. 2Does the exponential function have a square root? 7Non-mathematician submitting to top maths journal? 1What’s a natural candidate for an analytic function that interpolates the tower function? -1Parametrization of the boundary of the Mandelbrot set -1Approach to solving a differential-functional equation 0Faa di Bruno’s formula for inverse functions ? 1What are some early examples of creation of lists / catalogues of (particularly) combinatorial objects? 0Noninteger iterates of functions: How to get ODE from flow at a given time?