bachotex2006-boguslaw-jackowski-pearl1.tex
bachotex2006-boguslaw-jackowski-pearl1.tex
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%%% Bogus\l{}aw Jackowski & Piotr Strzelczyk: sigma tweak % A sum operator that adjusts its width automatically to the widest % subscript or superscript -- perhaps completely useless ;-) % Note: pdfTeX is required for clippling; you may wish to use % other tools for this purpose % defining the parts of the symbol \def\SIGMAleft{\copy0 } \def\SIGMAright{\copy1 } \def\SIGMAcenter{\copy2 } % preparing the parts of the symbol \setbox0\hbox{\tenex \char88\kern-.6em} \setbox1\hbox{\kern-.8em\tenex \char88} \setbox2\hbox{\hbox{\kern-.8em\tenex \char88\kern-.6em}} % clipping: \pdfxform0 \setbox0\hbox{\pdfrefxform\pdflastxform} \pdfxform1 \setbox1\hbox{\pdfrefxform\pdflastxform} \pdfxform2 \setbox2\hbox{\pdfrefxform\pdflastxform} % assembling: \def\SIGMA{% \mathop{\hbox{\SIGMAleft \kern-.1em \xleaders\SIGMAcenter\hfill \kern-.1em\SIGMAright}}\limits}% with \nolimits behaves ``traditionally'' $ \SIGMA^{\rm a}\quad \SIGMA^{\rm sum}\quad \SIGMA^{\rm operator}\quad \SIGMA^{\rm that\ adjusts}\quad \SIGMA^{\rm its\ width\ automatically} _{\rm to\ the\ widest\ subscript\ or\ superscript} $ \end
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