There are several other resources available if you want to learn more about the Space Elevator.
Space Elevator Technical Resources on the Web
The Space Elevator Feasibility Condition offers the most up to date technical analysis of what will be required to build a Space Elevator from both the tether strength and power systems perspectives. These two problems are linked because a stength in one can make up for a lack in the other. If the tether is not as strong as hoped, a more robust power system would be able to push climbers up the tether faster and thus still allow for a large amount of cargo to be moved.
Looking specifically at the tether, the Ribbon Mass Worksheet produced by the Spaceward Foundation allows an easy format to play with different variables such as tether strength and length to see how much mass is required and how much lift capacity is available. Be warned that the sheet is full of acronyms and is best viewed in companion with the Feasibility Condition.
The SE (Space Elevator) Analysis Spreadsheet. This provides you with the ability to calculate the characteristics of a Space Elevator and vary the inputs to those calculations. Thus the spreadsheet allows you to see the impact upon the mass, capacity, time to build and other important aspects of a Space Elevator when different strength of ribbon, type of deployment spacecraft, efficiency of climber power array or other critical choices are made.