typo in head exercises

01_numpy_basics.ipynb

@@ -2427,7 +2427,9 @@
     }
    },
    "source": [
-    "## Ex 1. Create an array containing integers from $2$ to $2^6$\n"
+    "## Ex 1.1\n",
+    "\n",
+    "Create an array containing integers from $2$ to $2^6$\n"
    ]
   },
   {
@@ -2450,7 +2452,9 @@
     }
    },
    "source": [
-    "## 1.1 Print `ndarray` attributes and properties\n",
+    "## Ex 1.2 \n",
+    "\n",
+    "Print `ndarray` attributes and properties\n",
     "(e.g. `type`, `dtype`, `shape...`) using previous on"
    ]
   },
@@ -2474,7 +2478,9 @@
     }
    },
    "source": [
-    "## Ex 2. Create a 3x3 Matrix array and fill it with random integer numbers\n",
+    "## Ex 1.3\n",
+    "\n",
+    "Create a 3x3 Matrix array and fill it with random integer numbers\n",
     "\n",
     "- _hint_: Take a look at `np.random.randint`"
    ]
@@ -2499,7 +2505,9 @@
     }
    },
    "source": [
-    "## Ex3. Create a list containing $5$ others lists of integers, all of the same size. Convert this list of lists into a matrix (i.e. `numpy.ndarray`)\n"
+    "## Ex 1.4\n",
+    "\n",
+    "Create a list containing $5$ others lists of integers, all of the same size. Convert this list of lists into a matrix (i.e. `numpy.ndarray`)\n"
    ]
   },
   {
@@ -2518,7 +2526,9 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "#### Ex 3.1 What happens if we generate an array converting a list of lists of different size/length?"
+    "## Ex 1.5\n",
+    "\n",
+    "What happens if we generate an array converting a list of lists of different lengths?"
    ]
   },
   {