On Mon, Apr 29, 2019 at 2:30 AM Andrey Novoseltsev <novos...@gmail.com> wrote:
>
> Hello,
>
> I got a report about GAP problem in SageMathCell, but it looks like the GAP 
> interface in Sage itself is having issues. I am getting an empty string from 
> the following command:
> sage: print(gap.eval("""
> ....: D_4 := SmallGroup(8,3);
> ....: IsAbelian( D_4 );
> ....: List( ConjugacyClasses( D_4 ), Size );
> ....: IsCyclic( D_4 );
> ....: Size( AllSubgroups( D_4 ) );
> ....: Size( Set( D_4, Order ) );
> ....: IsSolvable( D_4 );"""))
>
> All commands work fine in GAP and even in Sage each one seems to be working, 
> but certain combinations of them do not, while some do - I can't understand 
> the system here...
>
> Does anyone have any ideas on what is going on?

It might be a bug in the pexpect interface I guess.  If I try, say,
just the first 2 or 3 snippets of the code you gave above I get the
full output.  But by the `Size( AllSubgroups( D_4 ) );` it becomes
empty.  I if I do just `D_4 := SmallGroup(8,3); Size( AllSubgroups(
D_4 ) );` it produces the correct output.

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