> < ^ From:

> < ^ Subject:

Dear Gap-forum, and Vahid,

There is no problem: the syntax error is merely a warning. For example,

f:=function(n) if n>0 then return g(n-1); else return 0; fi; end; g:=function(n) if n>0 then return f(n-1); else return 1; fi; end;

yields an, admittedly somewhat inefficient, function f that determines

n mod 2 for natural numbers n.

Best regards,

Jan

answering:

> Dear Gap-Froum,

>

> I have written a recursive program on GAP which contains two

> subroutines A and B such that A calls B, and B calls A.

> When I define A at the first, GAP does not know B.

> and when I define B, it does not know A. And I receive

> "Syntax error: warning: unbound global variable".

> Do you know How I can fix that?

>

> Thanks,

> Vahid Dabbaghian

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