10.5

The Schroder-Bernsein Theorem!!  I'm so happy we are finally learning how to use this theorem.  It makes a lot of sense, that if you prove A is less than or equal to B as well as B being less than or equal to A that A=B, and thus meaning the have the same cardiality.  It is just hard for me to know the equation to pick, when deciding what to map them to.  I also liked reading the history about the earlier mathematicians.  They were smart smart men.