Merge branch 'main' into update_markov_chain_I

Author: mmcky

.github/workflows/ci.yml

@@ -38,7 +38,7 @@ jobs:
         shell: bash -l {0}
         run: pip list
       - name: Download "build" folder (cache)
-        uses: dawidd6/action-download-artifact@v9
+        uses: dawidd6/action-download-artifact@v11
         with:
           workflow: cache.yml
           branch: main

.github/workflows/collab.yml

@@ -20,7 +20,7 @@ jobs:
         shell: bash -l {0}
         run: pip list
       - name: Download "build" folder (cache)
-        uses: dawidd6/action-download-artifact@v9
+        uses: dawidd6/action-download-artifact@v11
         with:
           workflow: cache.yml
           branch: main

.github/workflows/publish.yml

@@ -39,7 +39,7 @@ jobs:
         shell: bash -l {0}
         run: pip list
       - name: Download "build" folder (cache)
-        uses: dawidd6/action-download-artifact@v9
+        uses: dawidd6/action-download-artifact@v11
         with:
           workflow: cache.yml
           branch: main

lectures/eigen_II.md

@@ -238,7 +238,7 @@ A = \begin{bmatrix} 0.5 & 0.1 \\
 \end{bmatrix}
 $$
 
-$A$ here is also a primitive matrix since $A^k$ is everywhere nonnegative for $k \in \mathbb{N}$.
+$A$ here is also a primitive matrix since $A^k$ is everywhere positive for some $k \in \mathbb{N}$.
 
 $$
 B = \begin{bmatrix} 0 & 1 \\ 
@@ -392,7 +392,7 @@ We are now prepared to bridge the languages spoken in the two lectures.
 
 A primitive matrix is both irreducible and aperiodic.
 
-So Perron-Frobenius theorem explains why both {ref}`Imam and Temple matrix <mc_eg3>` and [Hamilton matrix](https://en.wikipedia.org/wiki/Hamiltonian_matrix) converge to a stationary distribution, which is the Perron projection of the two matrices
+So Perron-Frobenius theorem explains why both {ref}`Imam and Temple matrix <mc_eg3>` and {ref}`Hamilton matrix <mc_eg2>` converge to a stationary distribution, which is the Perron projection of the two matrices
 
 ```{code-cell} ipython3
 P = np.array([[0.68, 0.12, 0.20],

lectures/troubleshooting.md

@@ -65,7 +65,5 @@ One way to give feedback is to raise an issue through our [issue tracker](https:
 Please be as specific as possible.  Tell us where the problem is and as much
 detail about your local set up as you can provide.
 
-Another feedback option is to use our [discourse forum](https://discourse.quantecon.org/).
-
 Finally, you can provide direct feedback to [contact@quantecon.org](mailto:contact@quantecon.org)