i thought all these sorts of things were ironed out by now:

In [24]: z*d1
---------------------------------------------------------------------------
<type 'exceptions.TypeError'>             Traceback (most recent call 
last)

/home/kyle/<ipython console> in <module>()

/home/kyle/element.pyx in element.RingElement.__mul__()

/home/kyle/element.pyx in element.bin_op_c()

<type 'exceptions.TypeError'>: unsupported operand parent(s) for '*': 
'Univariate Polynomial Ring in z over Polynomial Ring in b1, b2, b3 over 
Polynomial Ring in d1, d2, d3, a1, a2, a3 over Rational Field' and 
'Polynomial Ring in d1, d2, d3, a1, a2, a3 over Rational Field'
> /home/kyle/element.pyx(2008)element.bin_op_c()


In [25]: version()
Out[25]: 'SAGE Version 2.4.1.2, Release Date: 2007-03-28'



and the closely related bug

In [26]: B(d1)
<type 'exceptions.TypeError'>             Traceback (most recent call last)
etc

In [27]: B
Out[27]: Polynomial Ring in b1, b2, b3 over Polynomial Ring in d1, d2, d3, 
a1, a2, a3 over Rational Field



can some wonderful person who is more intimate with this part of the code 
send me a patch? muchas muchas gracias!

kyle


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