diff --git a/notebooks/numpy/index-slicing.ipynb b/notebooks/numpy/index-slicing.ipynb
index 5006b10..27f828f 100644
--- a/notebooks/numpy/index-slicing.ipynb
+++ b/notebooks/numpy/index-slicing.ipynb
@@ -68,7 +68,7 @@
     },
     {
       "cell_type": "code",
-      "execution_count": 2,
+      "execution_count": 3,
       "metadata": {
         "id": "hAs4d-8M_xoD"
       },
@@ -79,7 +79,7 @@
     },
     {
       "cell_type": "code",
-      "execution_count": 3,
+      "execution_count": null,
       "metadata": {
         "colab": {
           "base_uri": "https://localhost:8080/"
@@ -114,7 +114,7 @@
     },
     {
       "cell_type": "code",
-      "execution_count": 4,
+      "execution_count": null,
       "metadata": {
         "colab": {
           "base_uri": "https://localhost:8080/"
@@ -149,7 +149,7 @@
     },
     {
       "cell_type": "code",
-      "execution_count": 5,
+      "execution_count": 6,
       "metadata": {
         "id": "UCM-zVojardI"
       },
@@ -164,7 +164,7 @@
     },
     {
       "cell_type": "code",
-      "execution_count": 6,
+      "execution_count": null,
       "metadata": {
         "colab": {
           "base_uri": "https://localhost:8080/"
@@ -209,7 +209,7 @@
     },
     {
       "cell_type": "code",
-      "execution_count": 7,
+      "execution_count": null,
       "metadata": {
         "colab": {
           "base_uri": "https://localhost:8080/"
@@ -242,7 +242,7 @@
     },
     {
       "cell_type": "code",
-      "execution_count": 8,
+      "execution_count": null,
       "metadata": {
         "colab": {
           "base_uri": "https://localhost:8080/"
@@ -272,6 +272,17 @@
         "Nótese la diferencia con las listas de python, en las que `l[:]` es la manera estándar de crear una *copia* de una lista `l`. En el caso de *numpy*, si se quiere realizar una copia, se ha de usar el método `copy` (por ejemplo, `v.copy()`)."
       ]
     },
+    {
+      "cell_type": "code",
+      "source": [
+        "v_copy = v.copy()"
+      ],
+      "metadata": {
+        "id": "RokeCr7534lp"
+      },
+      "execution_count": 7,
+      "outputs": []
+    },
     {
       "cell_type": "markdown",
       "metadata": {
@@ -301,13 +312,13 @@
     },
     {
       "cell_type": "code",
-      "execution_count": 9,
+      "execution_count": 8,
       "metadata": {
         "colab": {
           "base_uri": "https://localhost:8080/"
         },
         "id": "TykBJ9JI_xoI",
-        "outputId": "6b261758-0a49-4d1e-b0b3-d19d387d7588"
+        "outputId": "58d105e6-9471-4472-de7f-3386aa234404"
       },
       "outputs": [
         {
@@ -318,7 +329,7 @@
             ]
           },
           "metadata": {},
-          "execution_count": 9
+          "execution_count": 8
         }
       ],
       "source": [
@@ -326,6 +337,31 @@
         "c2d[2]"
       ]
     },
+    {
+      "cell_type": "code",
+      "source": [
+        "print(c2d)"
+      ],
+      "metadata": {
+        "id": "S9ZL99sd4ENf",
+        "outputId": "b7206148-78c9-4ec0-9cd7-de711f992097",
+        "colab": {
+          "base_uri": "https://localhost:8080/"
+        }
+      },
+      "execution_count": 9,
+      "outputs": [
+        {
+          "output_type": "stream",
+          "name": "stdout",
+          "text": [
+            "[[1 2 3]\n",
+            " [4 5 6]\n",
+            " [7 8 9]]\n"
+          ]
+        }
+      ]
+    },
     {
       "cell_type": "markdown",
       "metadata": {
@@ -343,7 +379,7 @@
           "base_uri": "https://localhost:8080/"
         },
         "id": "25sSVC1l_xoI",
-        "outputId": "68ecf372-9812-41b2-c167-44a14b906882"
+        "outputId": "3df56d8e-c9c0-491b-9f03-878f2c698db3"
       },
       "outputs": [
         {
@@ -378,7 +414,7 @@
           "base_uri": "https://localhost:8080/"
         },
         "id": "bizhjYPh_xoJ",
-        "outputId": "ca508277-b458-4655-ba2b-2f9382482e21"
+        "outputId": "3d06ac48-40da-4d11-f2a4-bb31eb004bcb"
       },
       "outputs": [
         {
@@ -413,7 +449,7 @@
           "base_uri": "https://localhost:8080/"
         },
         "id": "ckTeln_g_xoK",
-        "outputId": "88eff21f-2f7d-45ca-8f7c-fa97f3455a1b"
+        "outputId": "be8e78f8-0f49-4e83-ac79-72059de1c2bf"
       },
       "outputs": [
         {
@@ -447,13 +483,13 @@
     },
     {
       "cell_type": "code",
-      "execution_count": 13,
+      "execution_count": 14,
       "metadata": {
         "colab": {
           "base_uri": "https://localhost:8080/"
         },
         "id": "VnD5R9kq_xoK",
-        "outputId": "07e6e879-f67b-4e32-8562-ef442b259b48"
+        "outputId": "0054b908-fcfc-420e-f938-945790c29643"
       },
       "outputs": [
         {
@@ -465,7 +501,7 @@
             ]
           },
           "metadata": {},
-          "execution_count": 13
+          "execution_count": 14
         }
       ],
       "source": [
@@ -483,7 +519,31 @@
     },
     {
       "cell_type": "code",
-      "execution_count": 14,
+      "source": [
+        "l = list(range(10, 20))\n",
+        "print(list(enumerate(l)))"
+      ],
+      "metadata": {
+        "id": "9UtSBrCf4jKb",
+        "outputId": "a4d80e99-75a5-4c03-9240-e6dd47bfb6fd",
+        "colab": {
+          "base_uri": "https://localhost:8080/"
+        }
+      },
+      "execution_count": 16,
+      "outputs": [
+        {
+          "output_type": "stream",
+          "name": "stdout",
+          "text": [
+            "[(0, 10), (1, 11), (2, 12), (3, 13), (4, 14), (5, 15), (6, 16), (7, 17), (8, 18), (9, 19)]\n"
+          ]
+        }
+      ]
+    },
+    {
+      "cell_type": "code",
+      "execution_count": null,
       "metadata": {
         "colab": {
           "base_uri": "https://localhost:8080/"
@@ -529,7 +589,7 @@
     },
     {
       "cell_type": "code",
-      "execution_count": 15,
+      "execution_count": null,
       "metadata": {
         "colab": {
           "base_uri": "https://localhost:8080/"
@@ -570,7 +630,7 @@
     },
     {
       "cell_type": "code",
-      "execution_count": 16,
+      "execution_count": null,
       "metadata": {
         "colab": {
           "base_uri": "https://localhost:8080/"
@@ -613,6 +673,113 @@
         ":::"
       ]
     },
+    {
+      "cell_type": "code",
+      "source": [
+        "# con fuerza bruta y np.ndenumerate\n",
+        "arr_enumerate = {k:v for v, k in np.ndenumerate(arr)}\n",
+        "idx = arr_enumerate[813]\n",
+        "print(idx)"
+      ],
+      "metadata": {
+        "id": "aWvsu08k6gFB",
+        "outputId": "5eab8374-cd16-4f01-c3a7-4db66491fa58",
+        "colab": {
+          "base_uri": "https://localhost:8080/"
+        }
+      },
+      "execution_count": 23,
+      "outputs": [
+        {
+          "output_type": "stream",
+          "name": "stdout",
+          "text": [
+            "(9, 4, 0, 1)\n"
+          ]
+        }
+      ]
+    },
+    {
+      "cell_type": "code",
+      "source": [
+        "arr[idx]"
+      ],
+      "metadata": {
+        "id": "TmS7L2Cg7BDc",
+        "outputId": "e56b65f9-ed87-49b5-b777-643197a1df4f",
+        "colab": {
+          "base_uri": "https://localhost:8080/"
+        }
+      },
+      "execution_count": 24,
+      "outputs": [
+        {
+          "output_type": "execute_result",
+          "data": {
+            "text/plain": [
+              "813"
+            ]
+          },
+          "metadata": {},
+          "execution_count": 24
+        }
+      ]
+    },
+    {
+      "cell_type": "code",
+      "source": [
+        "813 % 25"
+      ],
+      "metadata": {
+        "id": "PG11_PJ87a6q",
+        "outputId": "979d0153-9a18-4b6e-cc20-d153b5737d3b",
+        "colab": {
+          "base_uri": "https://localhost:8080/"
+        }
+      },
+      "execution_count": 30,
+      "outputs": [
+        {
+          "output_type": "execute_result",
+          "data": {
+            "text/plain": [
+              "13"
+            ]
+          },
+          "metadata": {},
+          "execution_count": 30
+        }
+      ]
+    },
+    {
+      "cell_type": "code",
+      "source": [
+        "arr = np.arange(2100).reshape((25, 6, 7, 2))\n",
+        "n = 813\n",
+        "i = n // (6*7*2)\n",
+        "j = ()\n",
+        "k = 0\n",
+        "l = 0\n",
+        "print(arr[i, j, k, l])"
+      ],
+      "metadata": {
+        "id": "wxNMKZGt5sLt",
+        "outputId": "1cd73f28-a9cb-40e8-a7db-b682890b3e88",
+        "colab": {
+          "base_uri": "https://localhost:8080/"
+        }
+      },
+      "execution_count": 32,
+      "outputs": [
+        {
+          "output_type": "stream",
+          "name": "stdout",
+          "text": [
+            "756\n"
+          ]
+        }
+      ]
+    },
     {
       "cell_type": "markdown",
       "metadata": {
@@ -624,7 +791,7 @@
     },
     {
       "cell_type": "code",
-      "execution_count": 17,
+      "execution_count": null,
       "metadata": {
         "colab": {
           "base_uri": "https://localhost:8080/"
@@ -661,7 +828,7 @@
     },
     {
       "cell_type": "code",
-      "execution_count": 18,
+      "execution_count": null,
       "metadata": {
         "colab": {
           "base_uri": "https://localhost:8080/"
@@ -697,7 +864,7 @@
     },
     {
       "cell_type": "code",
-      "execution_count": 19,
+      "execution_count": null,
       "metadata": {
         "colab": {
           "base_uri": "https://localhost:8080/"
@@ -733,7 +900,7 @@
     },
     {
       "cell_type": "code",
-      "execution_count": 20,
+      "execution_count": null,
       "metadata": {
         "colab": {
           "base_uri": "https://localhost:8080/"
@@ -768,7 +935,7 @@
     },
     {
       "cell_type": "code",
-      "execution_count": 25,
+      "execution_count": null,
       "metadata": {
         "colab": {
           "base_uri": "https://localhost:8080/"
@@ -803,7 +970,7 @@
     },
     {
       "cell_type": "code",
-      "execution_count": 26,
+      "execution_count": null,
       "metadata": {
         "colab": {
           "base_uri": "https://localhost:8080/"
@@ -831,33 +998,37 @@
     },
     {
       "cell_type": "code",
-      "execution_count": 27,
+      "execution_count": 34,
       "metadata": {
         "colab": {
           "base_uri": "https://localhost:8080/"
         },
         "id": "40WHNmgq_xoT",
-        "outputId": "683765b0-bc5b-455d-c5dd-af3d1c24af7c"
+        "outputId": "19bd8ef6-b9a9-465f-bdc0-efedbf1c5503"
       },
       "outputs": [
         {
-          "output_type": "execute_result",
-          "data": {
-            "text/plain": [
-              "array([3, 6])"
-            ]
-          },
-          "metadata": {},
-          "execution_count": 27
+          "output_type": "stream",
+          "name": "stdout",
+          "text": [
+            "[3 6]\n",
+            "(2,)\n",
+            "[[3]\n",
+            " [6]]\n",
+            "(2, 1)\n"
+          ]
         }
       ],
       "source": [
-        "c2d[:2, 2]"
+        "print(c2d[:2, 2])\n",
+        "print(c2d[:2, 2].shape)\n",
+        "print(c2d[:2, 2:])\n",
+        "print(c2d[:2, 2:].shape)"
       ]
     },
     {
       "cell_type": "code",
-      "execution_count": 28,
+      "execution_count": null,
       "metadata": {
         "colab": {
           "base_uri": "https://localhost:8080/"
@@ -894,7 +1065,7 @@
     },
     {
       "cell_type": "code",
-      "execution_count": 29,
+      "execution_count": null,
       "metadata": {
         "id": "RgvW7LRz_xoU",
         "outputId": "b31f7c84-f581-44d5-8297-4030c39b6a2d",
@@ -932,7 +1103,7 @@
     },
     {
       "cell_type": "code",
-      "execution_count": 30,
+      "execution_count": null,
       "metadata": {
         "id": "5a2v7IlMpb7r"
       },
@@ -944,7 +1115,7 @@
     },
     {
       "cell_type": "code",
-      "execution_count": 31,
+      "execution_count": null,
       "metadata": {
         "colab": {
           "base_uri": "https://localhost:8080/"
@@ -988,6 +1159,41 @@
         ":::"
       ]
     },
+    {
+      "cell_type": "code",
+      "source": [
+        "arr = np.arange(3*4*2).reshape((3, 4, 2))\n",
+        "arr2 = np.zeros((3, 4, 2))\n",
+        "assert arr.shape == (3, 4, 2)\n",
+        "assert arr2.shape == (3, 4, 2)\n",
+        "\n",
+        "subarr = arr[2, 3:4, :]\n",
+        "print(subarr)\n",
+        "print(subarr.shape)\n",
+        "\n",
+        "subarr2 = arr[:2, :3, :1]\n",
+        "print(subarr2.shape)"
+      ],
+      "metadata": {
+        "id": "vDXfjcpI-PUF",
+        "outputId": "17cc7afc-ddc7-4594-808f-aaf532beadb8",
+        "colab": {
+          "base_uri": "https://localhost:8080/"
+        }
+      },
+      "execution_count": 43,
+      "outputs": [
+        {
+          "output_type": "stream",
+          "name": "stdout",
+          "text": [
+            "[[22 23]]\n",
+            "(1, 2)\n",
+            "(2, 3, 1)\n"
+          ]
+        }
+      ]
+    },
     {
       "cell_type": "markdown",
       "metadata": {
@@ -1010,7 +1216,7 @@
     },
     {
       "cell_type": "code",
-      "execution_count": 35,
+      "execution_count": null,
       "metadata": {
         "id": "aCvfEAkM_xoV"
       },
@@ -1021,7 +1227,7 @@
     },
     {
       "cell_type": "code",
-      "execution_count": 36,
+      "execution_count": null,
       "metadata": {
         "colab": {
           "base_uri": "https://localhost:8080/"
@@ -1047,7 +1253,7 @@
     },
     {
       "cell_type": "code",
-      "execution_count": 37,
+      "execution_count": null,
       "metadata": {
         "colab": {
           "base_uri": "https://localhost:8080/"
@@ -1081,7 +1287,7 @@
     },
     {
       "cell_type": "code",
-      "execution_count": 38,
+      "execution_count": null,
       "metadata": {
         "colab": {
           "base_uri": "https://localhost:8080/"
@@ -1126,7 +1332,7 @@
     },
     {
       "cell_type": "code",
-      "execution_count": 39,
+      "execution_count": null,
       "metadata": {
         "colab": {
           "base_uri": "https://localhost:8080/"
@@ -1161,7 +1367,7 @@
     },
     {
       "cell_type": "code",
-      "execution_count": 40,
+      "execution_count": null,
       "metadata": {
         "colab": {
           "base_uri": "https://localhost:8080/"
@@ -1197,7 +1403,7 @@
     },
     {
       "cell_type": "code",
-      "execution_count": 41,
+      "execution_count": null,
       "metadata": {
         "colab": {
           "base_uri": "https://localhost:8080/"
@@ -1224,7 +1430,7 @@
     },
     {
       "cell_type": "code",
-      "execution_count": 42,
+      "execution_count": null,
       "metadata": {
         "colab": {
           "base_uri": "https://localhost:8080/"
@@ -1259,7 +1465,7 @@
     },
     {
       "cell_type": "code",
-      "execution_count": 43,
+      "execution_count": null,
       "metadata": {
         "colab": {
           "base_uri": "https://localhost:8080/"
@@ -1300,7 +1506,7 @@
     },
     {
       "cell_type": "code",
-      "execution_count": 44,
+      "execution_count": null,
       "metadata": {
         "colab": {
           "base_uri": "https://localhost:8080/"
@@ -1327,7 +1533,7 @@
     },
     {
       "cell_type": "code",
-      "execution_count": 45,
+      "execution_count": null,
       "metadata": {
         "colab": {
           "base_uri": "https://localhost:8080/"
@@ -1365,7 +1571,7 @@
     },
     {
       "cell_type": "code",
-      "execution_count": 46,
+      "execution_count": null,
       "metadata": {
         "colab": {
           "base_uri": "https://localhost:8080/"
@@ -1397,7 +1603,7 @@
     },
     {
       "cell_type": "code",
-      "execution_count": 47,
+      "execution_count": null,
       "metadata": {
         "colab": {
           "base_uri": "https://localhost:8080/"
@@ -1425,7 +1631,7 @@
     },
     {
       "cell_type": "code",
-      "execution_count": 48,
+      "execution_count": null,
       "metadata": {
         "colab": {
           "base_uri": "https://localhost:8080/"
@@ -1469,7 +1675,7 @@
     },
     {
       "cell_type": "code",
-      "execution_count": 49,
+      "execution_count": null,
       "metadata": {
         "colab": {
           "base_uri": "https://localhost:8080/"
@@ -1502,7 +1708,7 @@
     },
     {
       "cell_type": "code",
-      "execution_count": 49,
+      "execution_count": null,
       "metadata": {
         "id": "OuhXTz0R56pL"
       },
@@ -1557,8 +1763,7 @@
   ],
   "metadata": {
     "colab": {
-      "provenance": [],
-      "toc_visible": true
+      "provenance": []
     },
     "kernelspec": {
       "display_name": "Python 3.9.1 64-bit",