fermi_surface/theory.md

@@ -50,7 +50,7 @@ scanning the k-space can be a heavy computational task, especially for
 refine the mesh and keep in memory only the zones crossed by a band. So
 in a first step the algorithm will quad the Brillouin zone, into
 tetrahedras (triangles in 2D), and then evaluate if along the edges we
-can find a solution satisfying $`|\lambda_\nu(\vec{k},E)|\<a_n`$,
+can find a solution satisfying $`|\lambda_\nu(\vec{k},E)|<a_n`$,
 where $`a_n`$ is a given accuracy.
 
 If a solution is found along a tetrahedra edges, the mesh is refined in