- From: Robert Miner <RobertM@dessci.com>
- Date: Thu, 28 Oct 2004 10:02:58 -0500
- To: skvenkat@tnq.co.in
- CC: www-math@w3.org

Hi. > I have some trouble with Presentation MathML specs. > > Under the section: > > > 3.2.6.4 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>π</mi> (= 3.14...) > > which I feel should be <mn>π</mn> and > > <mn>ⅇ</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 π 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. --Robert ------------------------------------------------------------------ Dr. Robert Miner RobertM@dessci.com W3C Math Interest Group Co-Chair 651-223-2883 Design Science, Inc. "How Science Communicates" www.dessci.com ------------------------------------------------------------------

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