Hi, this is rather short one. I'm wondering if the two in the image below are equivalent. http://gyazo.com/62449de717e91b412f42771fd7d0a1af To me they appear to be equivalent, and I can't recognize any exceptions or trivial cases. Also, if it is equivalent would be it be acceptable to substitute between the two? Specifically when dealing with the area between two curves. I know it is simple, and I know how, to identify the 'top' function but I'm always looking for new short cuts. Thank you!