We will consider B-splines normalized so that their integral is one.
The splines may be of different orders and
defined on different knot sequences <I>x</I> and <I>y</I>.
Often the limits of integration will be the entire real line, - ∞
to + ∞. Note that (<A HREF=<tex2html_cr_mark>#problem#76><tex2html_cr_mark></A>) is a special case of (<A HREF=<tex2html_cr_mark>#problem2#77><tex2html_cr_mark></A>)
where <I>f</I> (<I>t</I>) is a spline.
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There are five different methods for calculating (<A HREF=<tex2html_cr_mark>#problem#78><tex2html_cr_mark></A>)
that will be considered:
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<tex2html_image_mark>#remunerate79#
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Of these five, only methods 1 and 5 are suitable for calculating
(<A HREF=<tex2html_cr_mark>#problem2#82><tex2html_cr_mark></A>). The first four methods will be touched on and the