##### ###### ##### ### # # ### # # ###### ## ## ## ## ## ## ## # # # # # ## ##### #### ##### # # # # # # # #### ## # ## ## ## ## # # # # # ## ## # ###### ## ### # ### # ######
##### ###### ##### ### # # ### # # ###### ## ## ## ## ## ## ## # # # # # ## ##### #### ##### # # # # # # # #### ## # ## ## ## ## # # # # # ## ## # ###### ## ### # ### # ######
Sigma notation basics
Summation notation uses the Greek letter sigma () to represent adding up terms. You write to mean .
The below sigma tells you where to start. The above sigma tells you where to stop. The expression after sigma tells you what to add.
For example, . And .
