Re: Transcendental Pi !!


> I have some trouble with Presentation MathML specs.
> Under the section:
> Mixing text and mathematics 
> it puts 
> <mo> there exists </mo>
> <mo> such that </mo>
> (so I assume that content decides what tag to put)

This is mostly a theoretical discussion, in my view.  From what I know
of how most people use MathML, and how most MathML-capable software
works, you should probably put things like this in <mtext> tags.

> but at the same time you say:
> <mi>&pi;</mi> (= 3.14...)
> which I feel should be <mn>&pi;</mn> and
> <mn>&ee;</mn>.
> Of course it would be much better if we had an entity like
> &TransendentalPi; (&tpi;).

Remember, this is presentation MathML.  So while one can discuss which
tag most accurately reflects the semantics of the underlying
mathematics, the key thing is whether you want something to *display*
like a variable, a number or text.  The difference between
<mi>&pi</mi> and <mn>&pi</pi> is that you will get an italic pi with
the <mi> and an upright &pi; with the <mn> (at least on systems that
can display both upright and italic greek.)

Similarly, the difference between <mo> such that </mo> and <mtext>such
that</mtext> is that you will get some default operator spacing around
the <mo>, while the <mtext> will be positions tight against the
surrounding constructs.


Dr. Robert Miner                      
W3C Math Interest Group Co-Chair                      651-223-2883
Design Science, Inc.   "How Science Communicates"

Received on Thursday, 28 October 2004 15:03:35 UTC