[Analysis] Various fixes

semester3/analysis-ii/cheat-sheet-jh/parts/vectors/differentiation/06_critical_points.tex

@@ -66,4 +66,4 @@ Finally, evaluate if the points are minima or maxima. It is often easiest to com
 where the lowest value is the global minimum and the highest value the global maximum (obviously).
 Always consider the corners as possible maxima or minima (if some corners are critical points, all are highly likely to be).
 
-The tangent plane at a critical point of a function $f : \R^n \rightarrow \R$, is of the form $\{ (x, y, z) \dividees z = \text{const} \}$, with $z = f(x_0)$.
+The tangent plane at a critical point of a function $f : \R^n \rightarrow \R$, is of the form $\{ (x, y, z) \divides z = \text{const} \}$, with $z = f(x_0)$.