1 | initial version |

WorksForMe(TM):

```
sage: from sage.rings.laurent_series_ring import *
sage: L.<z> = LazyLaurentSeriesRing(QQ)
sage: L.category()
Category of magmas and additive magmas
sage: 1/(1 - z)
1 + z + z^2 + z^3 + z^4 + z^5 + z^6 + ...
sage: 1/(1 - z) == 1/(1 - z)
```

**NOTE :** from the doc:

The definition of Laurent series rings is not initially imported into the global namespace. You need to import it explicitly to use it.

HTH,

2 | No.2 Revision |

~~WorksForMe(TM):~~WorksForMe(TM). On a Python 3-based 9.0.beta3 :

```
sage: from sage.rings.laurent_series_ring import *
sage: L.<z> = LazyLaurentSeriesRing(QQ)
sage: L.category()
Category of magmas and additive magmas
sage: 1/(1 - z)
1 + z + z^2 + z^3 + z^4 + z^5 + z^6 + ...
sage: 1/(1 - z) == 1/(1 - z)
```

**NOTE :** from the doc:

The definition of Laurent series rings is not initially imported into the global namespace. You need to import it explicitly to use it.

HTH,

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