From: Stan Devitt <jsdevitt@stratumtek.com>

Date: Wed, 14 Mar 2001 13:48:44 -0500

Message-ID: <001201c0acb7$6523ede0$6961a8c0@devitt.local>

To: "Tobias Burnus" <tobias.burnus@physik.fu-berlin.de>, <www-math@w3.org>

Cc: "Tobias Burnus" <tobias.burnus@physik.fu-berlin.de>, "Hans Hagen" <pragma@wxs.nl>

Date: Wed, 14 Mar 2001 13:48:44 -0500

Message-ID: <001201c0acb7$6523ede0$6961a8c0@devitt.local>

To: "Tobias Burnus" <tobias.burnus@physik.fu-berlin.de>, <www-math@w3.org>

Cc: "Tobias Burnus" <tobias.burnus@physik.fu-berlin.de>, "Hans Hagen" <pragma@wxs.nl>

For sure, the discussion of "float" (floating-point) is inadequate. The distinciton between float (floating-point) and real is supposed to be one of representation. A real number is entered as a single CDATA entry consisting of sign, digits and decimal point. <cn type="real">+345.237</cn> while a float is represented as a mantissa. and exponent separated by a <sep/> entry. (see definition of cn in appendix C) <cn type=:"floating-point" base="10">3.45237</sep>2</cn> The distinction between "complex" and "complex-cartesian" comes up in the context of identifiers. It is perfectly reasonable for someone to know that an identifier stands for a complex number without knowing what representation will be used for a particular instance of such a number. Thus, the type "complex" is a mathematical type while the types "complex-cartesian" and "complex-polar" are complex numbers with a particular data representation. Also, note that the possible type values is not a closed list. Stan. p.s. David C and I will be raising this with the working group and a more authoritive statement will come from the working group once we sort out the wording, etc. ----- Original Message ----- From: "Tobias Burnus" <tobias.burnus@physik.fu-berlin.de> To: <www-math@w3.org> Cc: "Tobias Burnus" <tobias.burnus@physik.fu-berlin.de>; "Hans Hagen" <pragma@wxs.nl> Sent: Wednesday, March 14, 2001 4:41 AM Subject: W3-MathML questions: real/float, annotation, etc. > Hi, > > while implementing MathML support for ConTeXt > (http://www.w3.org/Math/#Software) we came across of something which > seemed not to be very clear to us: > > a) It is not clear what the difference between "float" and "real. > (I cannot find "float" anymore, maybe the PDF file is/was older) > Also the difference between "complex" and "complex-cartesian" is not > clear. (I guess there is none.) > > b) Are there any guidelines which <semantic/> presentations should be > favoured and if it is allowed to have both xml-annotations MathML-Content > and/or MathML-Presentation (the examples use only the latter). > > c) Do you know a list of the different presentations of mathematical > operators (such as "n over k" which I cannot find in the HTML version). > > With warm regards, > > Tobias > > >Received on Wednesday, 14 March 2001 13:49:03 GMT

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