Dears members,

I'm trying to use subs method in PolynomialSequence, but when I doing that
I get the same PolynomialSequence. For example in code below my polynomial
sequence PS has only one polynomial (P) ... I'm trying to use subs but I
get the same polynomial. Where is wrong?

reset()
from sage.rings.polynomial.multi_polynomial_sequence import
PolynomialSequence
namesP=["X%d"%i for i in [0..2]]
R = BooleanPolynomialRing(len(namesP), namesP)
P = R.random_element()
PS = PolynomialSequence([P],R)
print PS
PS.subs({R.gens()[0]:1,R.gens()[1]:1})
print PS

-- 
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MSc. Juan del Carmen Grados Vásquez
Laboratório Nacional de Computação Científica
Tel: +55 21 97633 3228
(http://www.lncc.br/)
http://juaninf.blogspot.com
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