I am currently studying the book 3rd edition CLRS Algorithms textbook, Chapter 3. I had the exact same question as this post but I have one more question now:
What is a negative function?
These functions are estimates that describe the time it takes to perform a function (an algorithmic sequence) onto a list. How can the function be negative if it describes the time it takes to do work? Can an algorithm sort a list 10 seconds before it starts?