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      <text>23.5 Introduction</text>
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      <text><![CDATA[<h4>Introduction</h4>
In this Section we address the following problem:
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<i>Can we find a Fourier series expansion of a function defined over a finite interval?</i>
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Of course we recognise that such a function could not be periodic (as periodicity demands an infinite
interval). The answer to this question is yes but we must first convert the given non-periodic function
into a periodic function. There are many ways of doing this. We shall concentrate on the most useful
extension to produce a so-called <b>half-range Fourier series</b>.]]></text>
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