DATE: 1999-02-09
L2/99-043
DOC TYPE: |
Expert contribution |
TITLE: |
Mathematical brace pieces |
SOURCE: |
Murray Sargent III |
PROJECT: |
|
STATUS: |
Proposal |
ACTION ID: |
FYI |
DUE DATE: |
-- |
DISTRIBUTION: |
Worldwide |
MEDIUM: |
Paper and html |
NO. OF PAGES: |
4 |
A. Administrative |
|
1. Title |
Mathematical brace pieces |
2. Requester's name |
Murray Sargent III |
3. Requester type |
Expert request. |
4. Submission date |
1998-12-01 |
5. Requester’s reference |
Scientific and Technical Information Exchange (STIX) |
6a. Completion |
Complete proposal |
6b. More information to be provided? |
If requested |
B. Technical -- General |
|
1a. New script? Name? |
No. |
1b. Addition of characters to existing block? Name? |
Miscellaneous technical |
2. Number of characters |
18 |
3. Proposed category |
|
4. Proposed level of implementation and rationale |
Level 3; requires simple 2D display |
5a. Character names included in proposal? |
Yes. |
5b. Character names in accordance with guidelines? |
Yes. |
5c. Character shapes reviewable? |
|
6a. Who will provide computerized font? |
Microsoft Symbol font |
6b. Font currently available? |
Microsoft Symbol font |
6c. Font format? |
TrueType |
7a. Are references (to other character sets, dictionaries, descriptive texts, etc.) provided? |
Yes. |
7b. Are published examples (such as samples from newspapers, magazines, or other sources) of use of proposed characters attached? |
No |
8. Does the proposal address other aspects of character data processing? |
No |
C. Technical -- Justification |
|
1. Contact with the user community? |
Yes. Barbara Beeton, Murray Sargent III, Don Carroll |
2. Information on the user community? |
Mathematical software |
3a. The context of use for the proposed characters? |
Used in publication of research mathematics and other hard sciences. |
3b. Reference |
|
4a. Proposed characters in current use? |
Yes. |
4b. Where? |
Worldwide, by scientific and technical publishers, technical word processing programs |
5a. Characters should be encoded entirely in BMP? |
Yes. |
5b. Rationale |
Accurate publication of mathematical and scientific research on the Web is impossible without a comprehensive and accurate collection of symbols including various alphabetic variants in common use. Allocation in the BMP is in accordance with the Roadmap. |
6. Should characters be kept in a continuous range? |
Yes |
7a. Can the characters be considered a presentation form of an existing character or character sequence? |
No. |
7b. Where? |
|
7c. Reference |
|
8a. Can any of the characters be considered to be similar (in appearance or function) to an existing character? |
Yes |
8b. Where? |
The characters are used to create large forms of existing brackets, braces, parentheses, and integrals |
8c. Reference |
|
9a. Combining characters or use of composite sequences included? |
Yes |
9b. List of composite sequences and their corresponding glyph images provided? |
na |
10. Characters with any special properties such as control function, etc. included? |
No |
D. SC2/WG2 Administrative To be completed by SC2/WG2 |
|
1. Relevant SC 2/WG 2 document numbers: |
|
2. Status (list of meeting number and corresponding action or disposition) |
|
3. Additional contact to user communities, liaison organizations etc. |
|
4. Assigned category and assigned priority/time frame |
|
Other Comments |
|
The brace, bracket, parenthesis, and integral character pieces shown in the following table
æ ç è |
ö ÷ ø |
é ê ë |
ù ú û |
ó ô õ |
ì í î ï |
ü ý þ ï |
appear in a number of legacy character encodings. These encodings include TeX, PostScript, the Hewlett Packard Math8 character set, and the Microsoft Symbol font. They are used by technical word processing software to display arbitrarily large versions of (, ), [, ], {, }, and ò. Currently HP printers encode a set of such characters in the private-use zone. The top and bottom portions of the integral sign are already encoded at U+2320 and U+2321, respectively, since they occur in the DOS codepage 850. To be compatible with existing code sets and to aid in the printing and display of 2D mathematics, I propose that the following set of such characters be encoded:
æ
LEFT PARENTHESIS UPPER HOOKç
LEFT ALIGNED VERTICAL BAR® 007C | VERTICAL BAR
® 2758 | LIGHT VERTICAL BAR
®
ï CENTER ALIGNED VERTICAL BAR®
÷ RIGHT ALIGNED VERTICAL BAR®
ôINTEGRAL VERTICAL BARè
LEFT PARENTHESIS LOWER HOOKö
RIGHT PARENTHESIS UPPER HOOK÷
RIGHT ALIGNED VERTICAL BARø
RIGHT PARENTHESIS LOWER HOOKé
LEFT SQUARE BRACKET UPPER CORNERë
LEFT SQUARE BRACKET LOWER CORNERù
RIGHT SQUARE BRACKET UPPER CORNERû
RIGHT SQUARE BRACKET LOWER CORNERô
INTEGRAL VERTICAL BARì
LEFT CURLY BRACKET UPPER HOOKí
LEFT CURLY BRACKET MIDDLE PIECEî
LEFT CURLY BRACKET LOWER HOOKï
CENTER ALIGNED VERTICAL BARü
RIGHT CURLY BRACKET UPPER HOOKý
RIGHT CURLY BRACKET MIDDLE PIECEþ
RIGHT CURLY BRACKET LOWER HOOKDifferently aligned vertical bars are needed to ensure that the built up symbols fit together correctly.