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 \graphicspath{{\subfix{../images/}}}
 
 \begin{document}
-\section{Theory and methods}
+\section{Methods}
 % Problem 1
 When we study the Penning traps effect on a particle with a charge $q$, we need to consider the forces acting on the particle. We can use Newton's second law \eqref{eq:newton_second} to determine the position of a particle as a function of time. In addition, we introduce the Lorentz force \eqref{eq:lorentz_force}, which describes the force on the particle. The position can be described by %
 %