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<p>The "<em>Hopalong</em>"<top>*<top> attractor, authored by Barry Martin of Aston University in Birmingham, England [<ahref="#references">2</a>],<br>
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was popularized by A.K. Dewdney in the September 1986 issue of <em>Scientific American</em>. It gained further notoriety in Germany through an algorithm called <em><strong>“HÜPFER”</strong></em> in <em><strong>Spektrum der Wissenschaft</strong></em> [<ahref="#references">3</a>].<br>
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was popularized by A.K. Dewdney in the September 1986 issue of <em>Scientific American</em>. It gained further notoriety in Germany through an algorithm called <em>“HÜPFER”</em> in <em>Spektrum der Wissenschaft</em> [<ahref="#references">3</a>].<br>
<p>The mathematical definition of the Hopalong attractor is given by the following system of recursive functions, defined in [<ahref="#references">2</a>]:</p>
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### Historical Context
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The "*Hopalong*"<top>*<top> attractor, authored by Barry Martin of Aston University in Birmingham, England [[2](#references)],
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was popularized by A.K. Dewdney in the September 1986 issue of *Scientific American*. It gained further notoriety in Germany through an algorithm called ***“HÜPFER”*** in ***Spektrum der Wissenschaft***[[3](#references)].
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was popularized by A.K. Dewdney in the September 1986 issue of *Scientific American*. It gained further notoriety in Germany through an algorithm called *“HÜPFER”* in *Spektrum der Wissenschaft*[[3](#references)].
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<sub>*Nicknamed by A.K. Dewdney.</sub>
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### The Hopalong Attractor Functions
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pp. 109–129.
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[3]
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**A.K. Dewdney**, *Psychotapeten*, Program "HÜPFER," in *Spektrum der Wissenschaft: Computer Kurzweil*.
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**A.K. Dewdney**, *Psychotapeten*, Algorithm *"HÜPFER"*, in *Spektrum der Wissenschaft: Computer Kurzweil*.
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Spektrum der Wissenschaft Verlagsgesellschaft mbH & Co., Heidelberg, 1988.
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