more cleanup readme

exercises/exercise-mainfile/README.md

@@ -13,11 +13,11 @@ To summarize the problems differ in:
 * exercise1_1p_b: a one-phase compressible, stationary problem
 * exercise1_1p_c: a one-phase compressible, instationary problem
 
-The problem set-up for all three examples is always the same: It is a two dimensional problem and the domain is $`1m x 1m`$. It is a heterogeneous set-up with a lens in the middle of the domain which has a lower permeability ($`1e-12 m^2`$ compared to $`1e-10 m^2`$ in the rest of the domain).
+The problem set-up for all three examples is always the same: It is a two dimensional problem and the domain is $`1 m x 1 m`$. It is a heterogeneous set-up with a lens in the middle of the domain which has a lower permeability ($`1\cdot 10^{-12} m^2`$ compared to  $`1\cdot 10^{-10} m^2`$ in the rest of the domain).
 
 <img src="https://git.iws.uni-stuttgart.de/dumux-repositories/dumux-course/raw/master/exercises/extradoc/exercise1_1p_setup.png" width="1000">
 
-In the beginning there is a uniform pressure of $`1e5 Pa`$ in the whole domain. On the top and the bottom border dirichlet boundary conditions are set with a pressure of $`1e5 Pa`$ on top and $`2e5 Pa`$ on the bottom. At the sides there is no in- or outflow and there are no source terms.
+In the beginning there is a uniform pressure of $`1\cdot 10^5 Pa`$ in the whole domain. On the top and the bottom border dirichlet boundary conditions are set with a pressure of  $`1\cdot 10^5 Pa`$ on top and  $`2 \cdot 10^5 Pa`$ on the bottom. At the sides there is no in- or outflow and there are no source terms.
 
 ## Preparing the exercise