docstring

src/qibo/quantum_info/utils.py

@@ -347,10 +347,13 @@ def total_variation_distance(
     For probabilities :math:`p` and :math:`q`, the total variation distance is defined as
 
     .. math::
-        \\operatorname{TVD}(p, q) = \frac{1}{2} \\, \\norm{p - q}_{1}
-            = \\frac{1}{2} \\, \\sum_{x} \\, \\abs{p(x) - q(x)} \\, ,
+        \\begin{align}
+            \\operatorname{TVD}(p, \\, q) &= \\frac{1}{2} \\, \\|p - q\\|_{1}
+            &= \\frac{1}{2} \\, \\sum_{x} \\, \\left|{p(x) - q(x)\\right| \\, ,
+        \\end{align}
+
+    where :math:`\\|\\cdot\\|_{1}` detones the :math:`\\ell_{1}`-norm.
 
-    where :math:`\\norm{\\cdot}_{1}` detones the :math:`\\ell_{1}`-norm.
 
     Args:
         prob_dist_p (ndarray or list): discrete probability distribution :math:`p`.