<!DOCTYPE html><HTML lang="en"> <head><meta charset="utf-8"> <title>Smith (Nicholas J.J.) - Time Travel (Theo Todman's Book Collection - Paper Abstracts) </title> <link href="../../TheosStyle.css" rel="stylesheet" type="text/css"><link rel="shortcut icon" href="../../TT_ICO.png" /></head> <BODY> <CENTER> <div id="header"><HR><h1>Theo Todman's Web Page - Paper Abstracts</h1><HR></div><A name="Top"></A> <TABLE class = "Bridge" WIDTH=950> <tr><th><A HREF = "../../PaperSummaries/PaperSummary_22/PaperSummary_22736.htm">Time Travel</A></th></tr> <tr><th><A HREF = "../../Authors/S/Author_Smith (Nicholas J.J.).htm">Smith (Nicholas J.J.)</a></th></tr> <tr><th>Source: Stanford Encyclopedia of Philosophy, First published Thu Nov 14, 2013</th></tr> <tr><th>Paper - Abstract</th></tr> </TABLE> </CENTER> <P><CENTER><TABLE class = "Bridge" WIDTH=600><tr><td><A HREF = "../../PaperSummaries/PaperSummary_22/PaperSummary_22736.htm">Paper Summary</A></td><td><A HREF = "../../PaperSummaries/PaperSummary_22/PapersToNotes_22736.htm">Notes Citing this Paper</A></td><td><A HREF="#ColourConventions">Text Colour-Conventions</a></td></tr></TABLE></CENTER></P> <hr><P><FONT COLOR = "0000FF"><u>Author s Introduction</u><FONT COLOR = "800080"><ol type="1"><li>There is an extensive literature on <a name="1"></a><A HREF="../../Notes/Notes_11/Notes_1133.htm">time travel</A><SUP>1</SUP> in both philosophy and physics. Part of the great interest of the topic stems from the fact that reasons have been given both for thinking that <a name="2"></a><A HREF="../../Notes/Notes_11/Notes_1133.htm">time travel</A><SUP>2</SUP> is physically possible and for thinking that it is logically impossible! </li><li>This entry deals primarily with philosophical issues; issues related to the physics of <a name="3"></a><A HREF="../../Notes/Notes_11/Notes_1133.htm">time travel</A><SUP>3</SUP> are covered in the separate entries on <U><A HREF="#On-Page_Link_P22736_4">time travel and modern physics</A></U><SUB>4</SUB><a name="On-Page_Return_P22736_4"></A> and <U><A HREF="#On-Page_Link_P22736_5">time machines</A></U><SUB>5</SUB><a name="On-Page_Return_P22736_5"></A>. </li><li>We begin with the definitional question: what is <a name="4"></a><A HREF="../../Notes/Notes_11/Notes_1133.htm">time travel</A><SUP>6</SUP>? We then turn to the major objection to the possibility of backwards <a name="5"></a><A HREF="../../Notes/Notes_11/Notes_1133.htm">time travel</A><SUP>7</SUP>: the Grandfather paradox. Next, issues concerning <a name="6"></a><A HREF="../../Notes/Notes_0/Notes_39.htm">causation</A><SUP>8</SUP> are discussed  and then, issues in the metaphysics of time and change. We end with a discussion of the question why, if backwards <a name="7"></a><A HREF="../../Notes/Notes_11/Notes_1133.htm">time travel</A><SUP>9</SUP> will ever occur, we have not been visited by <a name="8"></a><A HREF="../../Notes/Notes_11/Notes_1133.htm">time travellers</A><SUP>10</SUP> from the future. </li></ol></FONT><BR><u>Sections</u><FONT COLOR = "800080"><ol type="1"><li>What is <a name="9"></a><A HREF="../../Notes/Notes_11/Notes_1133.htm">Time Travel</A><SUP>11</SUP>? <BR>&rarr; 1.1 Time Discrepancy <BR>&rarr; 1.2 Changing the Past </li><li>The Grandfather Paradox <BR>&rarr; 2.1 Can and Cannot <BR>&rarr; 2.2 Improbable Coincidences </li><li><a name="10"></a><A HREF="../../Notes/Notes_0/Notes_39.htm">Causation</A><SUP>12</SUP> <BR>&rarr; 3.1 Backwards <a name="11"></a><A HREF="../../Notes/Notes_0/Notes_39.htm">Causation</A><SUP>13</SUP> <BR>&rarr; 3.2 Causal Loops </li><li>Time and Change <BR>&rarr; 4.1 <a name="12"></a><A HREF="../../Notes/Notes_11/Notes_1133.htm">Time Travel</A><SUP>14</SUP> and Time <BR>&rarr; 4.2 <a name="13"></a><A HREF="../../Notes/Notes_11/Notes_1133.htm">Time Travel</A><SUP>15</SUP> and Change </li><li>Where are the <a name="14"></a><A HREF="../../Notes/Notes_11/Notes_1133.htm">Time Travellers</A><SUP>16</SUP>? </li></ol></FONT><BR><HR><BR><U><B>In-Page Footnotes</U></B><a name="On-Page_Link_P22736_4"></A><BR><BR><U><A HREF="#On-Page_Return_P22736_4"><B>Footnote 4</B></A></U>: See <a name="15"></a>"<A HREF = "../../Abstracts/Abstract_19/Abstract_19233.htm">Arntzenius (Frank) & Maudlin (Tim) - Time Travel and Modern Physics</A>". <a name="On-Page_Link_P22736_5"></A><BR><BR><U><A HREF="#On-Page_Return_P22736_5"><B>Footnote 5</B></A></U>: See <a name="16"></a>"<A HREF = "../../Abstracts/Abstract_17/Abstract_17912.htm">Earman (John) & Wuthrich (Christian) - Time Machines</A>". <BR><BR><FONT COLOR = "0000FF"><HR></P><a name="ColourConventions"></a><p><b>Text Colour Conventions (see <A HREF="../../Notes/Notes_10/Notes_1025.htm">disclaimer</a>)</b></p><OL TYPE="1"><LI><FONT COLOR = "0000FF">Blue</FONT>: Text by me; &copy; Theo Todman, 2018</li><LI><FONT COLOR = "800080">Mauve</FONT>: Text by correspondent(s) or other author(s); &copy; the author(s)</li></OL> <BR><HR><BR><CENTER> <TABLE class = "Bridge" WIDTH=950> <TR><TD WIDTH="30%">&copy; Theo Todman, June 2007 - August 2018.</TD> <TD WIDTH="40%">Please address any comments on this page to <A HREF="mailto:theo@theotodman.com">theo@theotodman.com</A>.</TD> <TD WIDTH="30%">File output: <time datetime="2018-08-02T09:57" pubdate>02/08/2018 09:57:27</time> <br><A HREF="../../Notes/Notes_10/Notes_1010.htm">Website Maintenance Dashboard</A></TD></TR> <TD WIDTH="30%"><A HREF="#Top">Return to Top of this Page</A></TD> <TD WIDTH="40%"><A HREF="../../Notes/Notes_11/Notes_1140.htm">Return to Theo Todman's Philosophy Page</A></TD> <TD WIDTH="30%"><A HREF="../../index.htm">Return to Theo Todman's Home Page</A></TD> </TR></TABLE></CENTER><HR> </BODY> </HTML>