This post achieves a fortuitous segue from the last post into my serious of articles on the beauty of Galois theory.
In the previous post I introduced Dedekind cuts as a means of constructing the real number line, and I said that this perspective is responsible for the completeness of the real numbers .
Now, that was completeness in the topological sense. There is another, very different notion of algebraic completeness.
A number system is called algebraically complete if every polynomial equation in one variable with coefficients from that number system can be solved in that number system.