Opened 5 years ago

Closed 5 years ago

#23392 closed defect (fixed)

Wrong certificate from is_relatively_complemented

Reported by: jmantysalo Owned by:
Priority: major Milestone: sage-8.1
Component: combinatorics Keywords:
Cc: tscrim, chapoton Merged in:
Authors: Jori Mäntysalo Reviewers: Frédéric Chapoton
Report Upstream: N/A Work issues:
Branch: 0f8598d (Commits, GitHub, GitLab) Commit: 0f8598dd5777e669d8d6b4b6bf266e291dc279b0
Dependencies: Stopgaps:

Status badges


L = LatticePoset(DiGraph('IYOS`G?CE?@?C?_@??'))

May output (False, (1, 8, 9)), but the certificate should be (7, 8, 9). The bug may not be visible in all architechtures.

Change History (6)

comment:1 Changed 5 years ago by jmantysalo

  • Branch set to u/jmantysalo/wrong_certificate_from_is_relatively_complemented

comment:2 Changed 5 years ago by jmantysalo

  • Authors set to Jori Mäntysalo
  • Cc tscrim chapoton added
  • Commit set to fc8aa42b88f967dd65d736b9c31b0006acf96f13
  • Status changed from new to needs_review

Corrected. Test code:

for i in range(1000):
    L = Posets.RandomLattice(10, 0.99)
    result = L.is_relatively_complemented(certificate=True)
    if not result[0]:
        a, b, c = result[1]
        ac = L.interval(a, c)
        if len(ac) != 3 or b != ac[1]:
    print("All OK")

Contains also three non-related trivial "are are" typos.

New commits:

fc8aa42Correct certificate for (not) relatively complemented lattice.

comment:3 follow-up: Changed 5 years ago by chapoton

  • Reviewers set to Frédéric Chapoton

Could you please correct another typo (same line as the first "are are"):

when these are not stongly

should be "strongly"

once done, you can set to positive

comment:4 Changed 5 years ago by git

  • Commit changed from fc8aa42b88f967dd65d736b9c31b0006acf96f13 to 0f8598dd5777e669d8d6b4b6bf266e291dc279b0

Branch pushed to git repo; I updated commit sha1. New commits:

0f8598dA typo.

comment:5 in reply to: ↑ 3 Changed 5 years ago by jmantysalo

  • Status changed from needs_review to positive_review

Replying to chapoton:

when these are not stongly

should be "strongly"

Done. Good catch, thanks.

comment:6 Changed 5 years ago by vbraun

  • Branch changed from u/jmantysalo/wrong_certificate_from_is_relatively_complemented to 0f8598dd5777e669d8d6b4b6bf266e291dc279b0
  • Resolution set to fixed
  • Status changed from positive_review to closed
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