- random_element() (sage.rings.power_series_ring.PowerSeriesRing_generic method)
- remove_var() (sage.rings.multi_power_series_ring.MPowerSeriesRing_generic method)
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- residue() (sage.rings.laurent_series_ring_element.LaurentSeries method)
- reversion() (sage.rings.power_series_poly.PowerSeries_poly method)
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