Revision history [back]
 | 1 | initial version |
Like this
sage: R = LazyPowerSeriesRing(QQ, 'x,y')
sage: x, y = R.gens()
sage: F = R.undefined(valuation=1)
sage: G = R.undefined(valuation=1)
sage: F.define(x / (1 + G)**2)
sage: G.define(y / (1 + F)**3)
sage: F[:3]
[x, -2*x*y]
