diff --git a/notebooks/seminar05.ipynb b/notebooks/seminar05.ipynb
index 0f438783332518bdc959b8b53b27a896e6284a7b..64d0a176b7c949fec77b514de3e7912b232e1639 100644
--- a/notebooks/seminar05.ipynb
+++ b/notebooks/seminar05.ipynb
@@ -655,15 +655,11 @@
    "outputs": [],
    "source": [
     "# implementieren Sie hier die Funktion do_n\n",
-    "def do_n(f, n):\n",
-    "    if n<=0:\n",
-    "        return\n",
-    "    f\n",
-    "    do_n(f,n-1)\n",
+    "\n",
     "# eine Testfunktion\n",
     "def testfunktion():\n",
     "    print(\"Ich wurde aufgerufen!\")\n",
-    "do_n(testfunktion(),5)\n",
+    "\n",
     "# rufen Sie hier die Funktion do_n auf, indem Sie die Funktion testfunktion sowie den Wert 7 als Argument übergeben "
    ]
   },
@@ -906,13 +902,8 @@
    "outputs": [],
    "source": [
     "import time\n",
-    "seconds=time.time()\n",
-    "minutes=seconds/60\n",
-    "hours=minutes/60\n",
-    "days=hours/24\n",
-    "weeks=days/7\n",
-    "years=days/365\n",
-    "print(seconds, minutes, hours, days, weeks, years, sep='\\t')\n"
+    "time.time()\n",
+    "\n"
    ]
   },
   {
@@ -930,18 +921,7 @@
    "source": [
     "import time\n",
     "\n",
-    "def print_time():\n",
-    "    seconds=time.time()\n",
-    "    days=seconds/(60*60*24)\n",
-    "    whole_days=seconds//(60*60*24)\n",
-    "    hours=(days-whole_days)*24\n",
-    "    whole_hours=int((days-whole_days)*24)\n",
-    "    minutes= (hours-whole_hours)*60\n",
-    "    whole_minutes=int((hours-whole_hours)*60)\n",
-    "    seconds_left=(minutes-whole_minutes)*60\n",
-    "    whole_seconds=int((minutes-whole_minutes)*60)\n",
-    "    print('days passed since January 1st 1970: ',int(whole_days),'\\nthe time (GMT) is :' ,whole_hours, ' hh : ',whole_minutes,' mm : ',whole_seconds, ' ss')\n",
-    "    \n",
+    "\n",
     "# Testaufruf\n",
     "print_time()"
    ]
@@ -979,31 +959,7 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "def check_fermat(a,b,c,n):\n",
-    "    if n>2:\n",
-    "        a_n=a\n",
-    "        b_n=b\n",
-    "        c_n=c\n",
-    "        for i in range(1,n):\n",
-    "            a_n=a_n*a\n",
-    "            b_n=b_n*b\n",
-    "            c_n=c_n*c\n",
-    "        if a_n+b_n==c_n:\n",
-    "            print('Unglaublich, Fermat lag falsch!')\n",
-    "        else:\n",
-    "            print('Nein, das funktioniert nicht.')\n",
-    "    else: \n",
-    "        print('n muss größer als 2 sein, um Fermats Satz zu überprüfen')\n",
-    "\n",
-    "\n",
-    "def  check_fermat2(a,b,c,n):\n",
-    "    a=int(a)\n",
-    "    b=int(b)\n",
-    "    c=int(c)\n",
-    "    n=int(n)\n",
-    "    check_fermat(a,b,c,n)\n",
-    "\n",
-    "check_fermat2(3,4,5,3)    "
+    "\n"
    ]
   },
   {
@@ -1025,22 +981,7 @@
    "execution_count": null,
    "metadata": {},
    "outputs": [],
-   "source": [
-    "def is_triangle(a,b,c):\n",
-    "    total=a+b+c\n",
-    "    k=0\n",
-    "    for i in (a,b,c):    \n",
-    "        if(total-2*i)<0:\n",
-    "            print('Nein nein nein!')\n",
-    "            k=1\n",
-    "            break\n",
-    "    if k==0:\n",
-    "        print('oh yes')\n",
-    "\n",
-    "\n",
-    "is_triangle(2,1,4)\n",
-    "    "
-   ]
+   "source": []
   },
   {
    "cell_type": "markdown",