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Topological pair
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<h2 id="references">References</h2> <ol> <li id="fn:1"><p>Hatcher, Allen (2002). Algebraic Topology. Cambridge University Press. ISBN 0-521-79540-0. <a href="0-521-79540-0" target="_blank">0-521-79540-0</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> <li id="fn:2"><p>Hatcher, Allen (2002). Algebraic Topology. Cambridge University Press. ISBN 0-521-79540-0. <a href="0-521-79540-0" target="_blank">0-521-79540-0</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li> </ol>