I reproduced the same error on my MacOS (Catalina) machine, it outputted 96 
32. 
My best guess would be its a one off case, owing to the fact that you 
didn't observe an error with other results.


On Thursday, April 23, 2020 at 2:55:20 AM UTC+5:30, Dennis Epple wrote:
>
> Hello,
>
> in my sage installation, the following code produces an odd output:
>
> B = [[1, 2, 3, 5, 7, 10],
>  [1, 2, 3, 7, 10, 11],
>  [1, 2, 4, 6, 9, 10],
>  [1, 2, 4, 7, 8, 10],
>  [1, 2, 5, 6, 10, 11],
>  [1, 2, 7, 8, 9, 10],
>  [2, 3, 4, 5, 9, 10],
>  [2, 3, 4, 9, 10, 11],
>  [2, 4, 5, 8, 10, 11],
>  [2, 4, 6, 7, 9, 10],
>  [2, 5, 6, 7, 10, 11],
>  [2, 5, 8, 9, 10, 11]]
> C = B + [[1..11]]
> I1 = IncidenceStructure([1..11],B)
> I2 = IncidenceStructure([1..11],C)
> A1 = I1.automorphism_group()
> A2 = I2.automorphism_group()
> print(len(A1),len(A2))
>
> The output is
>
> 96 32
>
>
> The online CoCalc server produces the expected
>
> 96 96
>
>
> I have not been able to reproduce the error on other incidence structures. 
>
>
> Sage version: 9.0
>
> Gap version: 4.10.2
>
> OS: Linux Mint 19.3
>
> Architecture: x86_64-pc-linux-gnu-default64-kv3
>
>
> Best regards,
>
> Dennis
>
>

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