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<spanclass="xref std std-term">Number</span>, this is a number, while for <spanclass="xref std std-term">Symbol</span> the value is a
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string (usually a single character). <codeclass="xref py py-class docutils literal notranslate"><spanclass="pre">Terminal</span></code> therefore needs its
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own <codeclass="xref py py-meth docutils literal notranslate"><spanclass="pre">__init__()</span></code> which will take a value argument.
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<codeclass="xref py py-class docutils literal notranslate"><spanclass="pre">Terminal.__init__</span></code> still has to call the <spanclass="xref std std-term">superclass</span>
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<codeclass="xref py py-class docutils literal notranslate"><spanclass="pre">Terminal.__init__</span></code> still has to call the <aclass="reference internal" href="8_inheritance.html#term-superclass"><spanclass="xref std std-term">superclass</span></a>
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constructor in order to ensure that the operands tuple is initialised.</p>
<title>1. Introduction: abstraction in mathematics and programming — Object oriented programming in Python for mathematicians 2020.0 documentation</title>
<spanid="introduction"></span><h1><spanclass="section-number">1. </span>Introduction: abstraction in mathematics and programming<aclass="headerlink" href="#introduction-abstraction-in-mathematics-and-programming" title="Permalink to this headline">¶</a></h1>
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<p>A core tool of mathematics is to define abstract objects and the
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<detailsclass="sphinx-bs dropdown card mb-3">
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<summaryclass="summary-title card-header">
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Video introduction.<divclass="summary-down docutils">
<pclass="card-text">Imperial students can also <aclass="reference external" href="https://imperial.cloud.panopto.eu/Panopto/Pages/Viewer.aspx?id=ee8cae7f-1b42-4db3-adc0-ac840144de53">watch this video on Panopto</a></p>
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</div>
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</details><p>A core tool of mathematics is to define abstract objects and the
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operations which apply to them. This approach defines all the basic
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building blocks which enable us to reason mathematically and perform
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calculations. We start off with basic objects like numbers and define
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