Opened 4 months ago

Closed 3 months ago

## #33966 closed defect (fixed)

# KnotInfo interface returns wrong braid_notation for the unknot

Reported by: | Sebastian Oehms | Owned by: | |
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Priority: | major | Milestone: | sage-9.7 |

Component: | algebraic geometry | Keywords: | |

Cc: | Merged in: | ||

Authors: | Sebastian Oehms | Reviewers: | Travis Scrimshaw |

Report Upstream: | N/A | Work issues: | |

Branch: | 99345e1 (Commits, GitHub, GitLab) | Commit: | 99345e14d8182d09ac8da35a53af78964d77c2e8 |

Dependencies: | Stopgaps: |

### Description

The original database does not provide a value for the `braid_notation`

of the unknot. Thus this value has been set individually in the interface, but unfortunately this value corresponds to a disjoint union of two unknots. This bug remained unnoticed because the construction of a link from a braid in Sage erases all additional unknots.

### Change History (5)

### comment:1 Changed 4 months ago by

Branch: | → u/soehms/fix_unknot_braid_notation_knotinfo_33966 |
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### comment:2 Changed 4 months ago by

Authors: | → Sebastian Oehms |
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Commit: | → 99345e14d8182d09ac8da35a53af78964d77c2e8 |

Status: | new → needs_review |

### comment:3 Changed 3 months ago by

Reviewers: | → Travis Scrimshaw |
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Status: | needs_review → positive_review |

LGTM.

### comment:5 Changed 3 months ago by

Branch: | u/soehms/fix_unknot_braid_notation_knotinfo_33966 → 99345e14d8182d09ac8da35a53af78964d77c2e8 |
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Resolution: | → fixed |

Status: | positive_review → closed |

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New commits:

`33966: initial`