1 | initial version |

When you write `QQbar['a']`

you get a polynomial ring over `QQbar`

with variable named `a`

, so an elliptic curve over `QQbar['a']`

must have coefficients *polynomial* in `a`

.

To use coefficients like `1/a`

, you can define instead `QQbar_a = QQbar['a'].fraction_field()`

.

2 | No.2 Revision |

When you write `QQbar['a']`

you get a polynomial ring over `QQbar`

with variable named `a`

, so an elliptic curve over `QQbar['a']`

must have coefficients *polynomial* in `a`

.

To use coefficients like `1/a`

, you can define instead `QQbar_a = QQbar['a'].fraction_field()`

, or `QQbar_a.<a> = FunctionField(QQbar)`

.

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