A common misconception is that ELF files are just for executables. We already have seen they can be used for partial pieces (object code). Another example includes shared libraries, and even core dumps (those core or a.out files). ELF is also used for the kernel and kernel modules on Linux machines.
In this book (Life of Fred: Fractions) and the next book (Life of Fred: Decimals and Percents) you can learn everything you need to know to begin algebra! In one morning, our hero: 1  Teaches a class at the university.  Buys a bicycle.
Two features immediately make this appealing to many families: low cost and a course design suitable for independent study. But there's much more to the Life of Fred books! The books are written by Dr. Stanley Schmidt, a retired math teacher who loves math and wants to share his enthusiasm with students. Part of his strategy is to build his math books around the adventures of Fred, a very young (six years old in the Geometry text) genius who is a math teacher at KITTENS University.