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diff --git a/math/sets b/math/sets
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@@ -4,9 +4,9 @@ Sets
.. warning:: Under progress!
-.. note:: Most of the definitions and notation in the section are based on [rudin]
+.. note:: Most of the definitions and notation in the section are based on [rudin]_
-If :latex:`$A \superset B$` and :latex:`$B \superset A$` we write :latex:`$A \eq B$`; otherwise :latex:`$A \neq B$`.
+If :latex:`$A \supset B$` and :latex:`$B \supset A$` we write :latex:`$A \eq B$`; otherwise :latex:`$A \neq B$`.
.. [rudin] `Principles of Mathematical Analysis (3rd ed)`:title:, by Walter Rudin.
McGraw-Hill, 1976