From 95a0d7ac830f9ba18b6a39a332584351941b4441 Mon Sep 17 00:00:00 2001
From: Adrian Lehmann <info@adrianlehmann.net>
Date: Mon, 29 Aug 2022 11:42:37 -0500
Subject: [PATCH] Change to provide command to avoid further sources of error

---
 .../MultiQubitSystemMeasurements.ipynb                        | 4 ++--
 .../Workbook_MultiQubitSystemMeasurements.ipynb               | 4 ++--
 .../SingleQubitSystemMeasurements.ipynb                       | 4 ++--
 .../Workbook_SingleQubitSystemMeasurements.ipynb              | 4 ++--
 4 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/tutorials/MultiQubitSystemMeasurements/MultiQubitSystemMeasurements.ipynb b/tutorials/MultiQubitSystemMeasurements/MultiQubitSystemMeasurements.ipynb
index 653c7597273b..5ec0d33b9d57 100644
--- a/tutorials/MultiQubitSystemMeasurements/MultiQubitSystemMeasurements.ipynb
+++ b/tutorials/MultiQubitSystemMeasurements/MultiQubitSystemMeasurements.ipynb
@@ -11,8 +11,8 @@
     "This will include measuring a single qubit in a multi-qubit system, as well as measuring multiple qubits simultaneously. \n",
     "\n",
     "We recommend to go through the [tutorial that introduces single qubit system measurements](../SingleQubitSystemMeasurements/SingleQubitSystemMeasurements.ipynb) before starting this one.\n",
-    "$\\renewcommand{\\ket}[1]{\\left\\lvert#1\\right\\rangle}$\n",
-    "$\\renewcommand{\\bra}[1]{\\left\\langle#1\\right\\rvert}$"
+    "$\\providecommand{\\ket}[1]{\\left\\lvert#1\\right\\rangle}$\n",
+    "$\\providecommand{\\bra}[1]{\\left\\langle#1\\right\\rvert}$"
    ]
   },
   {
diff --git a/tutorials/MultiQubitSystemMeasurements/Workbook_MultiQubitSystemMeasurements.ipynb b/tutorials/MultiQubitSystemMeasurements/Workbook_MultiQubitSystemMeasurements.ipynb
index 4b631f397c60..cca0e8b77011 100644
--- a/tutorials/MultiQubitSystemMeasurements/Workbook_MultiQubitSystemMeasurements.ipynb
+++ b/tutorials/MultiQubitSystemMeasurements/Workbook_MultiQubitSystemMeasurements.ipynb
@@ -21,8 +21,8 @@
     "1. Basic linear algebra\n",
     "2. Single and multi-qubit systems\n",
     "3. Single and multi-qubit gates\n",
-    "$\\renewcommand{\\ket}[1]{\\left\\lvert#1\\right\\rangle}$\n",
-    "$\\renewcommand{\\bra}[1]{\\left\\langle#1\\right\\rvert}$"
+    "$\\providecommand{\\ket}[1]{\\left\\lvert#1\\right\\rangle}$\n",
+    "$\\providecommand{\\bra}[1]{\\left\\langle#1\\right\\rvert}$"
    ]
   },
   {
diff --git a/tutorials/SingleQubitSystemMeasurements/SingleQubitSystemMeasurements.ipynb b/tutorials/SingleQubitSystemMeasurements/SingleQubitSystemMeasurements.ipynb
index 65b615a5cb7b..26ae040c8453 100644
--- a/tutorials/SingleQubitSystemMeasurements/SingleQubitSystemMeasurements.ipynb
+++ b/tutorials/SingleQubitSystemMeasurements/SingleQubitSystemMeasurements.ipynb
@@ -16,8 +16,8 @@
     "* Pauli basis measurements\n",
     "* Measurements in arbitrary orthogonal bases\n",
     "* Representing measurements as projector operators\n",
-    "$\\renewcommand{\\ket}[1]{\\left\\lvert#1\\right\\rangle}$\n",
-    "$\\renewcommand{\\bra}[1]{\\left\\langle#1\\right\\rvert}$"
+    "$\\providecommand{\\ket}[1]{\\left\\lvert#1\\right\\rangle}$\n",
+    "$\\providecommand{\\bra}[1]{\\left\\langle#1\\right\\rvert}$"
    ]
   },
   {
diff --git a/tutorials/SingleQubitSystemMeasurements/Workbook_SingleQubitSystemMeasurements.ipynb b/tutorials/SingleQubitSystemMeasurements/Workbook_SingleQubitSystemMeasurements.ipynb
index 740903100e13..b02bb861e4c0 100644
--- a/tutorials/SingleQubitSystemMeasurements/Workbook_SingleQubitSystemMeasurements.ipynb
+++ b/tutorials/SingleQubitSystemMeasurements/Workbook_SingleQubitSystemMeasurements.ipynb
@@ -21,8 +21,8 @@
     "1. Basic linear algebra\n",
     "2. The concept of a qubit\n",
     "3. Single-qubit gates\n",
-    "$\\renewcommand{\\ket}[1]{\\left\\lvert#1\\right\\rangle}$\n",
-    "$\\renewcommand{\\bra}[1]{\\left\\langle#1\\right\\rvert}$"
+    "$\\providecommand{\\ket}[1]{\\left\\lvert#1\\right\\rangle}$\n",
+    "$\\providecommand{\\bra}[1]{\\left\\langle#1\\right\\rvert}$"
    ]
   },
   {