-- Fibonacci sequence generator in ISETL
fib := func(n);
  if n <= 1 then
    return n;
  else
    return fib(n-1) + fib(n-2);
  end if;
end func;

-- Generate first 10 Fibonacci numbers
fibs := {fib(i) : i in [0..9]};
print(fibs);

-- Set operations example
A := {1, 2, 3, 4, 5};
B := {4, 5, 6, 7, 8};
print("Union:", A union B);
print("Intersection:", A inter B);
print("Difference:", A - B);