Update app.py

app.py

@@ -27,7 +27,7 @@ def generate_plot_image(alpha, beta, title_prefix=""): # Function arguments 'alp
          ax.text(0.5, 0.5, 'Invalid parameters\nCannot plot Beta(≤0, ≤0)',
                  horizontalalignment='center', verticalalignment='center', transform=ax.transAxes)
          ax.set_title(plot_title, fontsize=10)
-         ax.set_xlabel("Probability of Heads ($\theta$)", fontsize=9)
+         ax.set_xlabel("Probability of Heads (r)", fontsize=9)
          ax.set_ylabel("Density", fontsize=9)
     else:
         # Calculate PDF using the RENAMED distribution object
@@ -57,7 +57,7 @@ def generate_plot_image(alpha, beta, title_prefix=""): # Function arguments 'alp
                   pass # Ignore if pdf calculation fails for mean
 
         ax.set_title(plot_title, fontsize=10)
-        ax.set_xlabel("Probability of Heads ($\theta$)", fontsize=9)
+        ax.set_xlabel("Probability of Heads (r)", fontsize=9)
         ax.set_ylabel("Density", fontsize=9)
         ax.set_ylim(bottom=0)
         ax.grid(True, linestyle=':', alpha=0.7)