Some questions about fractions

[Jill Ramonsky]

Hi,

I'm wondering, exactly how equivalent are the following sequences:

U+00BC (vulgar fraction one quarter)
U+215F U+0034 (fraction numerator one; digit four)
U+0031 U+2044 U+0034 (digit one; fraction slash; digit four)

In particular, should they be rendered with the same glyph?

Is it possible to compose a single glyph for (say) twenty two over
seven, using the fraction slash?

If I were to write "one quarter" as U+0031 U+2044 U+0034, how should I
then write "one and a quarter"? Is there a "fraction space" which I
should use to separate the "1" from the "1/4"?

Jill




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[Eric Muller]

Post by Jill Ramonsky
U+00BC (vulgar fraction one quarter)
U+215F U+0034 (fraction numerator one; digit four)
U+0031 U+2044 U+0034 (digit one; fraction slash; digit four)
In particular, should they be rendered with the same glyph?

I would rather phrase the question as ""if all characters involved are
supported by a given layout system, should those three sequences produce
the same visible result?" The first change is to account for an
implementation not supporting, e.g., U+215F. The second change is to
allow different glyph organizations, as long as they produce the same ink.

That being said, I think the answer is yes, assuming non digits around
the last one.

Post by Jill Ramonsky
Is it possible to compose a single glyph for (say) twenty two over
seven, using the fraction slash?

Sure. It is ok to have a single glyph for arbitrarily large fragments of
text, fractions or not. If a glyph displaying "whole word" is available
and appropriate for the circumstances, a rendering engine could use it.

Post by Jill Ramonsky
If I were to write "one quarter" as U+0031 U+2044 U+0034, how should I
then write "one and a quarter"? Is there a "fraction space" which I
should use to separate the "1" from the "1/4"?

Unicode 4.0 Section 6.2 p 159 has the answer:

If the fraction is to be separated from a previous number, then a
space can be used, choosing the appropriate width (normal, thin,
zero width, and so on). For example 1 + THIN SPACE + 3 + FRACTION
SLASH + 4 is displayed as 1Ÿ.

Eric.

[Stefan Persson]

Post by Jill Ramonsky
Is it possible to compose a single glyph for (say) twenty two over

seven, using the fraction slash?

And what about more complex fractions, such as x/(1 + 2i)?

Stefan



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[j***@spin.ie]

Post by Stefan Persson
And what about more complex fractions, such as x/(1 + 2i)?

At some point (just where is debatable) it becomes advisable to use MathML or some other markup rather than plain text.






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[Stefan Persson]

Post by j***@spin.ie

Post by Stefan Persson
And what about more complex fractions, such as x/(1 + 2i)?

At some point (just where is debatable) it becomes advisable to use MathML or some other markup rather than plain text.

The problem is that some documents only allow plain text...

Stefan



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[Anto'nio Martins-Tuva'lkin]

Post by Stefan Persson
The problem is that some documents only allow plain text...

Then any attampt of typographical nicities should be discarded and
brackets and operation signs should ensure mathematical precision, a la
MS Excel formulas.

(And in these cases perhaps U+2044 should be interpreted as a plain
division sign -- like U+002F or U+2215, or also U+00F7 ?...)

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[Dao Xuan Nam]

Please remove me from the list.

Thanks.





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