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Ordinal logic
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<h2 id="references">References</h2> <ol> <li id="fn:1"><p>Solomon Feferman, Turing in the Land of O(z) in "The universal Turing machine: a half-century survey" by Rolf Herken 1995 ISBN 3-211-82637-8 page 111 <a href="/wiki/Solomon_Feferman" target="_blank">/wiki/Solomon_Feferman</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> <li id="fn:2"><p>Concise Routledge encyclopedia of philosophy 2000 ISBN 0-415-22364-4 page 647 <a href="/wiki/ISBN_(identifier)" target="_blank">/wiki/ISBN_(identifier)</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li> <li id="fn:3"><p>Alan Turing, Systems of Logic Based on Ordinals Proceedings London Mathematical Society Volumes 2–45, Issue 1, pp. 161–228.[1] <a href="https://web.archive.org/web/20141119022238/http://plms.oxfordjournals.org/content/s2-45/1/161.extract" target="_blank">https://web.archive.org/web/20141119022238/http://plms.oxfordjournals.org/content/s2-45/1/161.extract</a> <a href="#fnref:3" class="footnote-back-ref">↩</a></p></li> <li id="fn:4"><p>Solomon Feferman, Turing in the Land of O(z) in "The universal Turing machine: a half-century survey" by Rolf Herken 1995 ISBN 3-211-82637-8 page 111 <a href="/wiki/Solomon_Feferman" target="_blank">/wiki/Solomon_Feferman</a> <a href="#fnref:4" class="footnote-back-ref">↩</a></p></li> <li id="fn:5"><p>Alan Turing, Systems of Logic Based on Ordinals Proceedings London Mathematical Society Volumes 2–45, Issue 1, pp. 161–228.[1] <a href="https://web.archive.org/web/20141119022238/http://plms.oxfordjournals.org/content/s2-45/1/161.extract" target="_blank">https://web.archive.org/web/20141119022238/http://plms.oxfordjournals.org/content/s2-45/1/161.extract</a> <a href="#fnref:5" class="footnote-back-ref">↩</a></p></li> </ol>