On 7 Dec 2011, at 18:59, Mr. Sorouhesh wrote:
> I am new (unskilled) in this software, the GAP, and wanted to generate for
> example 4 groups as follows. Although the rules are used as it is its help;
> I cannot see the 4 finitely presented groups generated.
>
> f:=FreeGroup(2);;
>
> a:=f.1; b:=f.2;
>
> for k in[2..5]do G:=f/[a^2,b^k,(a*b)^3]; od;
>
> Syntax error, unexpected od, expecting ';'
>
> I think "for" cannot be applied for such these statements as I put above
> (G:=....). Any suggestion? :-)
You have to put spaces around [2..5] in the last line:
for k in [2..5] do G:=f/[a^2,b^k,(a*b)^3]; od;
Otherwise GAP can not parse it properly.
That is, the syntax of the 'for' loop is
for simple-var in list-expr do statements od;
so list-expr must be separated from 'in' and 'do'
Hope this helps,
Alexander
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