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User56437
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Post subject: Calculating Euler characteristics Posted: Wed Sep 25, 2019 12:54 pm |
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Hello, I am trying to use Singular to calculate Euler characteristics of some affine varieties over the complex numbers. I did a few tests using the EulerAff command and am getting strange results. For example I tried the following (and various similar alterations like changing the field to Q or R, changing the floating point number, adding more variables ...):
ring r = (complex,100,j),(x,y,z),dp; ideal I = x; EulerAff(I);
This gives the result 2. But this should be calculating the Euler characteristic of the complex plane and so should be 1. Does anybody know what is going on here/how I can correct this issue?
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User56437
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Post subject: Re: Calculating Euler characteristics Posted: Tue Oct 01, 2019 1:03 pm |
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So I ended up contacting the person who wrote the chern.lib library and they have corrected the code, which should be updated as well.
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hannes
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Post subject: Re: Calculating Euler characteristics Posted: Thu Oct 10, 2019 11:01 am |
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Joined: Wed May 25, 2005 4:16 pm Posts: 275
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