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+====================
+Sets
+====================
+
+.. warning:: Under progress!
+
+.. 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:`$A \neq B$`.
+
+.. [rudin] `Principles of Mathematical Analysis (3rd ed)`:title:, by Walter Rudin.
+ McGraw-Hill, 1976