NEKG33 Mathematical methods for economists
Chapter 12 : Day 12: Summation sign
By Lund University
Today we will admire the pretty summation sign ∑.
Sums and the summation sign
Here, we will look at the summation sign and the rules that you can use to simplify expressions using the summation sign. These rules are not new, they are the same rules that we have seen before, such as the distributive law. However, earlier, we only considered the sum of two elements. We extend this to sums of an arbitrary number of elements.