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 it is not true in general that catamorphisms are closed under composition


When is this true?

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<div>From page 3 of <a href="http://research.microsoft.com/en-us/um/people/emeijer/Papers/meijer94more.pdf" target="_blank">http://research.microsoft.com/en-us/um/people/emeijer/Papers/meijer94more.pdf</a>:</div><div><br></div>

<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex">
it is not true in general that catamorphisms are closed under composition</blockquote><div><br></div><div>When is this true?</div>

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