parcialna derivacia

[Hans GINZEL]

Antonin Strejc wrote:
> ...
> Lepsi je napsat si makerko.
>
> % RESENI 1:
>
> \def\lfrac#1#2{\setbox1\hbox{$#1$}\setbox2\hbox{$#2$}
> \ifdim\wd1>\wd2\setbox2\hbox to \wd1{\unhbox2\hfil}
> \else\setbox1\hbox to \wd2{\unhbox1\hfil}\fi
> \hbox{\box1}\over\hbox{\box2}}

To je velmi slozite.
Navic zlomek bude vzdy ve stylu T \over T, misto v display math modu ve
stylu T \over T', v text math modu ve stylu S \over S' (TeXbook,
str.141).

Nabizim reseni s pre`fill'ovanim puvodniho `fil'u.

% Zlomek, jehoz citatel i jmenovatel je zarovnan vzdy vlevo.
\def\lfrac#1#2{{#1\hfill \over #2\hfill}}

% Demo
$\lfrac {a^2}{b^2c^3} \qquad \lfrac{\partial f(x)}{\partial x}$

$$\lfrac {a^2}{b^2c^3} \qquad \lfrac{\partial f(x)}{\partial x}$$
\bye