- Usage:
`s .. t`

- Operator: ..
- Inputs:
`s`, a ring element`t`, a ring element

- Outputs:
- the sequence of consecutive generators of a polynomial ring, from
`s`to`t`, inclusive

- the sequence of consecutive generators of a polynomial ring, from

i1 : R = QQ[a..z] o1 = R o1 : PolynomialRing |

i2 : b .. i o2 = (b, c, d, e, f, g, h, i) o2 : Sequence |

i3 : plus oo o3 = b + c + d + e + f + g + h + i o3 : R |

Warning: former behavior involved making the names of the generators consecutive, so the results in the next example differ from those given before.

i4 : R = QQ[e,d,c,b,a,X_1,y,X_2] o4 = R o4 : PolynomialRing |

i5 : e .. a o5 = () o5 : Sequence |

i6 : X_1 .. X_2 o6 = (X , X ) 1 2 o6 : Sequence |

Warning: since former behavior involved only the names of the generators, there was no requirement that `s` and `t` be in the same ring, whereas now there is.