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Equivalence problem
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<h2 id="references">References</h2> <ol> <li id="fn:1"><p>P. Jančar. Equivalences of Pushdown Systems Are Hard, 2014. <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> <li id="fn:2"><p>J. E. Hopcroft and J. D. Ullman. Introduction to Automata Theory, Languages, and Computation, first edition, 1979. <a href="/wiki/Introduction_to_Automata_Theory,_Languages,_and_Computation" target="_blank">/wiki/Introduction_to_Automata_Theory,_Languages,_and_Computation</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li> </ol>