Remove extra period at end of sentence

chapters/equations.tex

@@ -561,7 +561,7 @@ \section{Synchronous Data-flow Principle and Single Assignment Rule}\label{synch
 Variable values can be accessed at any time instant during continuous integration and at event instants.
 
 \item At every time instant, during continuous integration and at event instants,
-the equations express relations between variables which have to be fulfilled concurrently..
+the equations express relations between variables which have to be fulfilled concurrently.
 
 \item Computation and communication at an event instant does not take time.
 \begin{nonnormative}