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+# gauge theory
+
+- a [[field theory]]
+  - [[wp]] https://en.wikipedia.org/wiki/Gauge_theory
+    - [[go]] [[wp]]
+    - In [[physics]], a gauge theory is a type of field theory in which the [[Lagrangian]] does not change (is [[invariant]]) under local transformations from certain [[Lie groups]]. 
+  - [[planet-hopf]]
+
diff --git a/gauge-theory.md b/gauge-theory.md
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+# gauge theory
+
diff --git a/planet-hopf.md b/planet-hopf.md
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+++ b/planet-hopf.md
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 # planet hopf
 
-- [[go]] http://www.math.toronto.edu/~drorbn/Gallery/KnottedObjects/PlanetHopf/
-- [[eric weinstein]]
-  - with [[joe rogan]]
+- an [[object]] in [[gauge theory]]
+  - [[go]] http://www.math.toronto.edu/~drorbn/Gallery/KnottedObjects/PlanetHopf/
+  - [[eric weinstein]]
+    - with [[joe rogan]]
 
 https://twitter.com/O__C___D__/status/1380590675536797697