Opened 3 years ago

Last modified 3 months ago

## #29099 needs_info enhancement

# extension of admissible indices conventions for tensors with indices

Reported by: | Léo Brunswic | Owned by: | |
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Priority: | trivial | Milestone: | sage-9.8 |

Component: | manifolds | Keywords: | tensor, tensor_with_indices, contraction, symmetries, manifolds |

Cc: | Eric Gourgoulhon, Michal Bejger | Merged in: | |

Authors: | Léo Brunswic | Reviewers: | |

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

Branch: | u/gh-LBrunswic/extension_of_admissible_indices_conventions_for_tensors_with_indices (Commits, GitHub, GitLab) | Commit: | 93ec3e7edac270064869a578a7a4359e2da31cb1 |

Dependencies: | Stopgaps: |

### Description (last modified by )

Following a request from Jonathan Thornburg we include the following indices convention which is standard but up to now not implemented.

`X_{ab} := R^c{}_a{}^d{}_b \bar{h}_{cd`

}

### Change History (14)

### comment:1 Changed 3 years ago by

Description: | modified (diff) |
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### comment:2 Changed 3 years ago by

Branch: | → u/gh-LBrunswic/extension_of_admissible_indices_conventions_for_tensors_with_indices |
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### comment:3 Changed 3 years ago by

Commit: | → 93ec3e7edac270064869a578a7a4359e2da31cb1 |
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### comment:4 Changed 3 years ago by

Status: | new → needs_review |
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### comment:5 Changed 3 years ago by

Milestone: | sage-9.1 → sage-9.2 |
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Batch modifying tickets that will likely not be ready for 9.1, based on a review of the ticket title, branch/review status, and last modification date.

### comment:6 Changed 2 years ago by

See https://sympa.obspm.fr/wws/arc/sagemanifolds.list/2020-01/msg00003.html and https://sympa.obspm.fr/wws/arc/sagemanifolds.list/2020-06/msg00000.html for discussions and issues relative to this ticket.

### comment:7 Changed 2 years ago by

Status: | needs_review → needs_info |
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### comment:8 Changed 2 years ago by

Component: | PLEASE CHANGE → manifolds |
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### comment:9 Changed 2 years ago by

Milestone: | sage-9.2 → sage-9.3 |
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### comment:10 Changed 21 months ago by

Milestone: | sage-9.3 → sage-9.4 |
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Setting new milestone based on a cursory review of ticket status, priority, and last modification date.

### comment:11 Changed 17 months ago by

Milestone: | sage-9.4 → sage-9.5 |
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Setting a new milestone for this ticket based on a cursory review.

### comment:12 Changed 12 months ago by

Milestone: | sage-9.5 → sage-9.6 |
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Stalled in `needs_review`

or `needs_info`

; likely won't make it into Sage 9.5.

### comment:13 Changed 8 months ago by

Milestone: | sage-9.6 → sage-9.7 |
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### comment:14 Changed 3 months ago by

Milestone: | sage-9.7 → sage-9.8 |
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Branch pushed to git repo; I updated commit sha1. New commits:

`Bug correction and updated documentation and tests`