MikiBeta February 27, 2018 Important notice: Please refer to the new MikiBeta page. Below is the old version that corresponds to the LOPSTER 2010 paper. What is MikiBeta? Proof trees are useful. We use proof trees for type checking as well as proofs in deductive systems. However, it is often tedious to write proof trees by hand. Proof trees tend to require a large space; we have to rewrite metavar