Change the title of the notebook

exercise_04/norm/Euclidean Norm.ipynb

@@ -4,7 +4,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "# Summation over a triangular area - parallelisation experiments\n",
+    "# Euclidean norm - parallelisation experiments\n",
     "\n",
     "### Description of the program\n",
     "The test programs compute the Euclidean norm of a vector of dimension $D=50000000$. The computation is rerun for $N=100$ times and the shortes measured time is reported. Choosing the run with the shortest time models the case when the computation code is already present in the I-cache (the I-cache is hot).\n",