For more information you can refer to the following links:

• Amdahl's Law (https://home.wlu.edu/~whaleyt/classes/parallel/topics/amdahl.html), by Aaron Michalove
• Uses and abuses of Amdahl's Law, Journal of Computing Sciences in Colleges 17.2 (2001): 288-293, S. Krishnaprasad
• Learning Concurrency in Python: Build highly efficient, robust, and concurrent applications (2017), Elliot Forbes