diff --git a/.github/workflows/build-pages.yml b/.github/workflows/build-pages.yml
index 84c1514..bd97c56 100644
--- a/.github/workflows/build-pages.yml
+++ b/.github/workflows/build-pages.yml
@@ -35,7 +35,6 @@ jobs:
       - name: create environment with mamba
         uses: conda-incubator/setup-miniconda@v2
         with:
-          mamba-version: "*"
           channels: conda-forge,defaults
           auto-activate-base: false
           activate-environment: rmarkdown-env
diff --git a/exercise-sheet-0.Rmd b/exercise-sheet-0.Rmd
index 1d2fdb7..dd4ee15 100644
--- a/exercise-sheet-0.Rmd
+++ b/exercise-sheet-0.Rmd
@@ -12,7 +12,10 @@ title: "Exercise sheet 0: Math"
 Given the recursive Formulation, fill in the array underneath:
 
 $$
-a_n = a_{n-1} + d\ \forall \ 2\leq n < x
+\begin{align*}
+a_{n+1} &= a_{n} + d, \quad \forall n : 2 \leqslant n < x, \\
+a_{n+1} &= 0, \quad \text{else}
+\end{align*}
 $$
 
 ```{r, echo=FALSE}
@@ -47,7 +50,7 @@ column index
 
 
 $$
-D_{i, j} = max (D_{i-1. j-1} + 2, D_{i-1, j} + 3, D_{i, j-1} + 1)\ \forall i\ge j > 1
+D_{i, j} = max (D_{i-1. j-1} + 2, D_{i-1, j} + 3, D_{i, j-1} + 1)\ \forall i, j : i  \ge  j > 1
 $$
 ```{r, echo=FALSE}
 htmltools::includeHTML("html/matrixMax.html")