Talk:Mathematical notation/to do


 * Give proper definition. ---> added a first cut at it.
 * some of this properly belongs in History of mathematics, but
 * The first use of a symbol for free variables (Egyptian heap)
 * Diophantine equations
 * Ratios and proportions
 * symbols for Integrals and sums -- when they first arose
 * Hindu-Arabic notation for numbers
 * Knuth arrow notation - Graham's number
 * O notation