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Indeed, the common factor in the example is actually 0. </div>
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And thanks very much for the quick fix.</div>
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Best regards!</div>
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Feng</div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>发件人:</b> Vladimir V. Kisil <V.Kisil@leeds.ac.uk><br>
<b>发送时间:</b> 2020年6月20日 3:12<br>
<b>收件人:</b> GiNaC discussion list <ginac-list@ginac.de>; Feng Feng <f.feng@outlook.com><br>
<b>抄送:</b> Vladimir V. Kisil <V.Kisil@leeds.ac.uk><br>
<b>主题:</b> Re: [GiNaC-list] problem about collect_common_factors</font>
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<div class="PlainText">>>>>> On Wed, 17 Jun 2020 08:24:21 +0000, Feng Feng <f.feng@outlook.com> said:<br>
<br>
FF> Hi all, I got a strange problem about collect_common_factors,<br>
FF> the problem can be reproduced by the following example: ------<br>
<br>
The trick with your expression is that the common factor (and thus<br>
the entire expression) is equal to 0. I have sent a patch to fix this: <br>
<br>
<a href="https://www.ginac.de/pipermail/ginac-devel/2020-June/002473.html">https://www.ginac.de/pipermail/ginac-devel/2020-June/002473.html</a><br>
<br>
Best wishes,<br>
Vladimir<br>
-- <br>
Vladimir V. Kisil <a href="http://www.maths.leeds.ac.uk/~kisilv/">
http://www.maths.leeds.ac.uk/~kisilv/</a><br>
Book: Geometry of Mobius Transformations <a href="http://goo.gl/EaG2Vu">
http://goo.gl/EaG2Vu</a><br>
Software: Geometry of cycles <a href="http://moebinv.sourceforge.net/">
http://moebinv.sourceforge.net/</a><br>
Jupyter: <a href="https://github.com/vvkisil/MoebInv-notebooks">https://github.com/vvkisil/MoebInv-notebooks</a><br>
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