Update to 20230912.

Author: pbienst

helmholtz/helmholtz.tex

@@ -161,7 +161,6 @@ \chapter{The Helmholtz equation}
 Derive the vectorial Helmholtz equation for the magnetic field in a uniform medium.
 \end{exer}
 
-
 \begin{exer}
   % difficulty: trivial
   % youtube: SxAkISAwbuU

preamble/ugent.tex

@@ -47,7 +47,7 @@ \chapter{Practical aspects related to the course}
 
 Important: if you did your bachelor's degree at UGent, you have already seen the material on complex calculus. In this case, students should also tackle chapter \ref{h:kk-receiver} on the Kramers-Kronig receiver, which is a direct application of the concepts of complex calculus to optical telecommunications.
 
-Your final grade for this course is a combination of three factors:
+Your final grade for this course is a combination of the following three factors:
 
 To gently encourage you to put in sustained effort throughout the semester, as opposed to wasting your time by cramming just before the exam, we ask that every week you email us the written traces of your engagement with this course (solved cues, exercises, ...). Do not spend any time cleaning these up, your draft notes are perfectly fine, even if they are difficulty to read or messy, as we only consider whether you were active, and not the details of your notes. So, this is very different from homework. Email either a scanned version of your paper notes, or pictures of the pages you took with your phone using a tool like Microsoft Lens or Google Lens. You are allowed to skip two weeks, to accommodate for exceptional circumstances. \textbf{Weekly mailing your notes} counts for 5 points out of 20 for the final grade.