I found some typo in Chapter2_MorePyMC/MorePyMC.ipynb.

1. In the section [A and B Together],
   "$\text{delta}=0$ =0$" should be "$\text{delta}=0$"

2. In the section [Initializing Stochastic variables],
  "where 0, 4 are the DiscreteUniform-specific upper and lower"
   should be "where 0, 4 are the DiscreteUniform specific lower and upper"

3. In the section [Normal distributions],
   "$\sigma^{2}$ instead of $\tau$" should be "$\sigma^{2}$ instead of $\tau^{-1}$