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**To**:*math-font-discuss@cogs.susx.ac.uk***Subject**:**Big operators (metafontical answer)****From**:*J%org Knappen <Joerg.Knappen@uni-mainz.de>***Date**: Tue, 17 Aug 1993 14:08 +0200

It is a design feature of the displaystyle operators, that their boxen extend a bit over the baseline. The ``picture'' does not extend over the baseline (except for possibly one pixel because of rounding). I don't know the rationale behind this decision. Here's a snippet out of bigop.mf to illustrate the situation, the relvant macro is ``padded'' which enlarges the height and depth by the amount given in sharp units. cmchar "\textstyle set union sign"; beginchar(oct"123",15u#,0,10/6dh#); adjust_fit(0,0); pickup pencircle scaled stem; lft x1=hround u; x2=x1; x3=w-x3; x4=x5=w-x1; top y1=eps; bot y3=-d; y2=y4=2/3[y1,y3]; y5=y1; draw z1---z2...z3...z4---z5; % stems and cup labels(1,2,3,4,5); endchar; cmchar "\displaystyle set union sign"; beginchar(oct"133",20u#,0,14/6dh#); padded 1/6dh#; adjust_fit(0,0); pickup pencircle scaled curve; lft x1=hround u; x2=x1; x3=w-x3; x4=x5=w-x1; top y1=eps; bot y3=-d; y2=y4=2/3[y1,y3]; y5=y1; draw z1---z2...z3...z4---z5; % stems and cup labels(1,2,3,4,5); endchar; --J"org Knappen

**Follow-Ups**:**Re: Big operators (metafontical answer)***From:*Michael Downes <MJD@MATH.AMS.ORG>

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