Chern-Simons Term [The Physics Travel Guide]

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-For a great summary see section 2 in [[https://arxiv.org/pdf/hep-th/0103017.pdf|Collaborating with David Gross; Descendants of the Chiral Anomaly]] by R. Jackiw
+For a great summary see section 2 in [[https://arxiv.org/pdf/hep-th/0103017.pdf|Collaborating with David Gross; Descendants of the Chiral Anomaly]] by R. Jackiw and the [[http://home.mathematik.uni-freiburg.de/cookies17/files/Moffatt_Freiburg%20Lecture%20Notes.pdf|Freiburg Lecture Notes]] by H.K.Moffatt
-<note tip>Chern-Simons terms are known under different names in different branches of physics. In fluid mechanics it is usually called "fluid helicity", in plasma physics and magnetohydrodynamics "magnetic helicity". In the context of field theories it is usually called Chern-Simons term.
+<note tip>Chern-Simons terms describe topological properties of systems. A topological property is something that remains unchanged under small geometric changes.
+Chern-Simons terms are known under different names in different branches of physics. In fluid mechanics it is usually called "fluid helicity", in plasma physics and magnetohydrodynamics "magnetic helicity". In the context of field theories it is usually called Chern-Simons term.
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