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Univ at Albany: W. F. Hammond: The GELLMU ArchiveWhat is a Reasonable Authoring <abbr >DTD</abbr><brk /> under <abbr >SGML</abbr> or <abbr >XML</abbr> for <abbr >MathML</abbr>?William F. Hammondhammondmath.albany.eduQQbar type="R" mml="mi"Gal type="(R,R)" mml="mo"galQ type="G"
&SecRef-1;IntroductionThere has been a recent resurgence of interest in href="http://www.w3.org/Math/"MathML, the rather granular XML language developed by the World Wide Web Consortium (W3C) HTML Math Working Group during the period 19962000, due to the availability of MathMLcapable builds of the browser href="http://www.mozilla.org/"Mozilla, the opensource development version of the popular browser NetScape
&SecRef-2;A Few ExamplesCompound fractions: abcd a db c The formula for solving the quadratic equation a x2 b x c 0 (in a field of characteristic 2): x b b2 4 a c2 a Mixed function application and multiplication: sin a x cos b x Newtons binomial series: (1 t)r k0 r(r 1)(r 2)(r k 1)k tk A differential equation: D2 y 3 x (D y)2 x cos x Stokess Theorem in space: S (curl F N) d S (F T) d s The continued fraction for the golden mean: 1 52 11111111 The representation Gal(Q Q) of a centrally important object that one might choose to declare as the symbol galQ In this instance, however the expression is formed using the following three declared symbols:The command regch is a variant of mbox that is intended to denote the normal version of a regular character found in a mathematical context when that character is suitable for a hypothetical algorithmic application of an accent such as ovbar A general mbox is regarded as not suitable for hypothetical algorithmic accenting. lclName Rendering GELLMU expansionQ Q regchboldQQbar Q ovbarregchboldQGal Gal mboxGal Here the example is repeated Gal(Q Q) with the same presented appearance but this time as the declared symbol galQ, which is defined without using other declared symbols in its definition