Non-planar graphs can require more than four colors for example this graph. General method for sketching the graph of a function72 11. It can be drawn so that no edges cross each other.
Read Fundamentals of Mathematics - Functions Graphs 2ed book reviews author details and more at Amazonin.
Read Fundamentals of Mathematics - Functions Graphs 2ed book reviews author details and more at Amazonin. Examples functions with and without maxima or minima71 10. Algebra 20 Section B. Read lecture notes pages 68.