Added existence of the Haar measure.

src/topology/notation.tex

@@ -22,6 +22,7 @@
     % Function Spaces
     $\mathrm{supp}(f)$ & Support of $f$. & \autoref{definition:support} \\
     $C_c(X; E)$ & Compactly supported continuous functions $X \to E$. & \autoref{definition:compactly-supported} \\
+    $C_c^+(X)$ & Compactly supported continuous functions $X \to [0, \infty)$ & \autoref{definition:non-negative-compactly-supported}
     $f \prec U$ & $f \in C_c(X; [0,1])$ with $\mathrm{supp}(f) \subset U$. & \autoref{definition:compactly-supported-01} \\
     $C_0(X; E)$ & Continuous functions vanishing at infinity. & \autoref{definition:vanish-at-infinity} \\
     $BC(X; E)$ & Bounded continuous functions $X \to E$. & \autoref{definition:bounded-continuous-function-space} \\