nothing interesting to see

unsupported/doc/Overview.dox

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+namespace Eigen {
+
+o /** \mainpage Eigen's unsupported modules
+
+This is the API documentation for Eigen's unsupported modules.
+
+These modules are contributions from various users. They are provided "as is", without any support.
+
+Don't miss the <a href="..//index.html">official Eigen documentation</a>.
+
+*/
+
+}