I tried (in the Sage shell)

```
K = QuadraticField(-3)
b = 1 / sqrt(-3) + (1 + sqrt(-3)) / 2
K(b)
```

But that failed with a TypeError exception. What is the problem?

1 | initial version |

I tried (in the Sage shell)

```
K = QuadraticField(-3)
b = 1 / sqrt(-3) + (1 + sqrt(-3)) / 2
K(b)
```

But that failed with a TypeError exception. What is the problem?

2 | simplify |

I tried (in the Sage shell)

~~K ~~a = ~~QuadraticField(-3)
b = 1 / sqrt(-3) + (1 + sqrt(-3)) / 2
K(b)
~~QuadraticField(-3)(sqrt(-3))

But that ~~failed ~~fails with a TypeError exception. What is the problem?

3 | No.3 Revision |

I tried (in the Sage shell)

```
K = QuadraticField(-3)
a =
```~~QuadraticField(-3)(sqrt(-3))
~~K(sqrt(-3))

But that fails with a TypeError exception. What is the problem?

I know that I can get the generator by `K.gen()`

but I want to be able to convert expressions to `K`

.

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