Bug 120638 - DOCX: The logical 'or' symbol | in the formula editor is not displayed correctly
Summary: DOCX: The logical 'or' symbol | in the formula editor is not displayed correctly
Status: NEW
Alias: None
Product: LibreOffice
Classification: Unclassified
Component: Formula Editor (show other bugs)
(earliest affected)
4.1 all versions
Hardware: All All
: medium normal
Assignee: Not Assigned
Keywords: filter:docx
: 123688 133217 (view as bug list)
Depends on:
Blocks: DOCX-Formula
  Show dependency treegraph
Reported: 2018-10-16 08:56 UTC by sebastian.wolf.dk
Modified: 2023-11-24 11:25 UTC (History)
5 users (show)

See Also:
Crash report or crash signature:


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Description sebastian.wolf.dk 2018-10-16 08:56:09 UTC
I am working on a docx file in Libreoffice Writer, and I have a formula that contains a vertical line such as x | y. My source code in the formula editor is "x divides y". However, when I save the document and re-open it, the formula appears as x v y, and the source code has changed to "x | y".

Steps to Reproduce:
1. open Libreoffice writer
2. insert a formula (Insert -> Object -> Formula..)
3. Write in source code window: " x divides y"
4. Save document as .docx
5. close and re-open document

Actual Results:
The formula appears as "x v y"

Expected Results:
The formula should appear as "x | y"

Reproducible: Always

User Profile Reset: No

Additional Info:
Comment 1 Regina Henschel 2018-10-16 21:33:05 UTC
@sebastian: Is there a special reason for using docx format?

Word uses OMML language for formulas in docx format, LibreOffice uses its proprietary "starmath" and common MathML in its odt format and works with an internal representation. Conversion errors are inevitable because the capabilities of the languages are different. You should discuss workarounds for conversion problems in a forum or mailing list.

Nevertheless this is an error. The "divides" operator is correctly converted to U+2223 on export, but on import (not touched by Word) it is not converted back to operator "divides".

As far as I have seen, MS Office seems to use a list derived from Unicode for to determine an "operator". Unfortunately the "divide" operator does not exist in the UI of the formula editor of MS Office. In case MS Office opens an odt document with e.g. "m divides k", the formula is transformed into MS Office own format, but when saving it back as docx, the "divides" is converted to U+007c, that is | the pipe character. Same happens with an docx document made by LibreOffice.

OMML has a tag opEmu, which could be used here to mark the "divides" character as operator. But I do not know whether that would give better results if it goes through Word. But at least it would make the markup unambiguous for LibreOffice.
Comment 2 Xisco Faulí 2018-10-17 10:11:16 UTC
Also reproduced in

Build ID: 3ca42d8d51174010d5e8a32b96e9b4c0b3730a53
Threads 4; Ver: 4.10; Render: default; 

Build ID: c15927f20d4727c3b8de68497b6949e72f9e6e9e

Version (Build ID: efca6f15609322f62a35619619a6d5fe5c9bd5a)
Comment 3 NISZ LibreOffice Team 2020-05-22 14:36:07 UTC
*** Bug 133217 has been marked as a duplicate of this bug. ***
Comment 4 NISZ LibreOffice Team 2020-05-22 14:36:24 UTC
*** Bug 123688 has been marked as a duplicate of this bug. ***
Comment 5 QA Administrators 2022-05-23 03:36:57 UTC Comment hidden (obsolete)
Comment 6 Rajasekaran Karunanithi 2022-12-19 22:39:40 UTC
Still presents in LO 7.6 alpha under Windows 10(x64).

Version: (X86_64) / LibreOffice Community
Build ID: ad387d5b984c6666906505d25685065f710ed55d
CPU threads: 4; OS: Windows 10.0 Build 19044; UI render: Skia/Raster; VCL: win
Locale: en-IN (en_IN); UI: en-US
Calc: threaded
Comment 7 bugmail 2023-11-24 10:29:58 UTC
In Calc, if one types “x|y” (U+007C "Vertical line"), the vertical line is interpreted and displayed as "Boolean OR".

If one types “x∣y” (U+2223 "Divides"), it's interpreted and displayed as…well, something, but I'm not quite sure what. It's a forward slash of some variety, but not setquotient or "Division (Slash)". In the formula the character remains U+2223, and this is what comes from Word, but I can't understand what LO Calc's trying to do here.
Comment 8 Regina Henschel 2023-11-24 11:25:50 UTC
(In reply to bugmail from comment #7)
> In Calc, if one types “x|y” (U+007C "Vertical line"), the vertical line is

Please write a new bug report. This report is about writing Math-objects in Writer, when the document has docx format and about its exchange with MS Word.

Please discuss the problem in the Ask forum beforehand to be sure, that it is really a bug.