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         <a class="dropdown-toggle" data-toggle="dropdown" href="#">Part 1
         <span class="caret"></span></a>
         <ul class="dropdown-menu">
-          <li><a href="../1-Introduction">1. Introduction</a></li>
-          <li><a href="../2-Intelligent-Agents">2. Intelligent Agents</a></li>
+          <li><a href="../01-Introduction">1. Introduction</a></li>
+          <li><a href="../02-Intelligent-Agents">2. Intelligent Agents</a></li>
         </ul>
       </li>
       <li class="dropdown">
         <a class="dropdown-toggle" data-toggle="dropdown" href="#">Part 2
         <span class="caret"></span></a>
         <ul class="dropdown-menu">
-          <li><a href="../3-Solving-Problems-By-Searching">3. Solving Problems By Searching</a></li>
-          <li><a href="../4-Beyond-Classical-Search">4. Beyond Classical Search</a></li>
-          <li><a href="../5-Adversarial-Search">5. Adversarial-Search</a></li>
-          <li><a href="../6-Constraint-Satisfaction-Problems">6. Constraint Satisfaction Problems</a></li>
+          <li><a href="../03-Solving-Problems-By-Searching">3. Solving Problems By Searching</a></li>
+          <li><a href="../04-Beyond-Classical-Search">4. Beyond Classical Search</a></li>
+          <li><a href="../05-Adversarial-Search">5. Adversarial-Search</a></li>
+          <li><a href="../06-Constraint-Satisfaction-Problems">6. Constraint Satisfaction Problems</a></li>
         </ul>
       </li>
       <li class="dropdown">
         <a class="dropdown-toggle" data-toggle="dropdown" href="#">Part 3
         <span class="caret"></span></a>
         <ul class="dropdown-menu">
-          <li><a href="../7-Logical-Agents">7. Logical Agents</a></li>
-          <li><a href="../8-First-Order-Logic">8. First Order Logic</a></li>
-          <li><a href="../9-Inference-In-First-Order-Logic">9. Inference in First Order Logic</a></li>
+          <li><a href="../07-Logical-Agents">7. Logical Agents</a></li>
+          <li><a href="../08-First-Order-Logic">8. First Order Logic</a></li>
+          <li><a href="../09-Inference-In-First-Order-Logic">9. Inference in First Order Logic</a></li>
           <li><a href="../10-Classical-Planning">10. Classical Planning</a></li>
           <li><a href="../11-Planning-And-Acting-In-The-Real-World">11. Planning and Acting in the Real World</a></li>
           <li><a href="../12-Knowledge-Representation">12. Knowledge Representation</a></li>
diff --git a/index.html b/index.html
index 186304c..d6393f6 100644
--- a/index.html
+++ b/index.html
@@ -33,11 +33,11 @@ <h2>Part Select</h2>
     <div id="part1" class="tab-pane fade in active">
       <h3>Artificial Intelligence</h3>
 		<dl class="dl-horizontal">
-			<dt><a href="./1-Introduction/">1. Introduction</a></dt>
+			<dt><a href="./01-Introduction/">1. Introduction</a></dt>
 			<dd>In which we try to explain why we consider artificial intelligence to be a subject
 			most worthy of study, and in which we try to decide what exactly it is, this being a
 			good thing to decide before embarking.</dd>
-			<dt><a href="./2-Intelligent-Agents/">2. Intelligent Agents</a></dt>
+			<dt><a href="./02-Intelligent-Agents/">2. Intelligent Agents</a></dt>
 			<dd>In which we discuss the nature of agents, perfect or otherwise, the diversity of
 			environments, and the resulting menagerie of agent types.</dd>
 		</dl>
@@ -45,16 +45,16 @@ <h3>Artificial Intelligence</h3>
     <div id="part2" class="tab-pane fade">
       <h3>Problem Solving</h3>
       <dl class="dl-horizontal">
-			<dt><a href="./3-Solving-Problems-By-Searching/">3. Solving Problems By Searching</a></dt>
+			<dt><a href="./03-Solving-Problems-By-Searching/">3. Solving Problems By Searching</a></dt>
 			<dd>In which we see how an agent can find a sequence of actions that achieves its
 			goals when no single action will do.</dd>
-			<dt><a href="./4-Beyond-Classical-Search/">4. Beyond Classical Search</a></dt>
+			<dt><a href="./04-Beyond-Classical-Search/">4. Beyond Classical Search</a></dt>
 			<dd>In which we relax the simplifying assumptions of the previous chapter, thereby
 			getting closer to the real world.</dd>
-			<dt><a href="./5-Adversarial-Search/">5. Adversarial Search</a></dt>
+			<dt><a href="./05-Adversarial-Search/">5. Adversarial Search</a></dt>
 			<dd>In which we examine the problems that arise when we try to plan ahead in a world
 			where other agents are planning against us.</dd>
-			<dt><a href="./6-Constraint-Satisfaction-Problems/">6. Constraint Satisfaction Problems</a></dt>
+			<dt><a href="./06-Constraint-Satisfaction-Problems/">6. Constraint Satisfaction Problems</a></dt>
 			<dd>In which we see how treating states as more than just little black boxes leads to the
 			invention of a range of powerful new search methods and a deeper understanding
 			of problem structure and complexity.</dd>
@@ -64,14 +64,14 @@ <h3>Problem Solving</h3>
 	<div id="part3" class="tab-pane fade">
       <h3>Knowledge Reasoning and Planning</h3>
       <dl class="dl-horizontal">
-			<dt><a href="./7-Logical-Agents/">7. Logical Agents</a></dt>
+			<dt><a href="./07-Logical-Agents/">7. Logical Agents</a></dt>
 			<dd>In which we design agents that can form representations of a complex world, use a
 			process of inference to derive new representations about the world, and use these
 			new representations to deduce what to do.</dd>
-			<dt><a href="./8-First-Order-Logic/">8. First Order Logic</a></dt>
+			<dt><a href="./08-First-Order-Logic/">8. First Order Logic</a></dt>
 			<dd>In which we notice that the world is blessed with many objects, some of which are
 			related to other objects, and in which we endeavor to reason about them.</dd>
-			<dt><a href="./9-Inference-In-First-Order-Logic/">9. Inference In First Order Logic</a></dt>
+			<dt><a href="./09-Inference-In-First-Order-Logic/">9. Inference In First Order Logic</a></dt>
 			<dd>In which we define effective procedures for answering questions posed in firstorder
 			logic.</dd>
 			<dt><a href="./10-Classical-Planning/">10. Classical Planning</a></dt>