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For the def math mode = , only \eqdef with a space at the end. In math mode together with def another material it may look like x = (x1 , . . , xn ) and as command sequence 1 $\vec{x}\eqdef\left(x_{1},\ldots,x_{n}\right)$ The fontsize of the top is one size smaller than the one from the base, but it is no problem to get both the same size, just increase the top or decrease the base. 20 \choose \choose \choose is like \atop with delimiters or like \frac without the fraction line and also with delimiters.

Same for the description environment. The problem is that a math expression in one of these environments is printed in default font shape, like the following example for a section and description environment: 22 Function f (x) = x2 This is y = f (x) Only a demonstration. And z = f (x, y) Another demonstration. With a redefinition of the \section and \item macros it is possible to get everything in bold font. 47 41 \mathversion \boldmath \unboldmath 24 OTHER MACROS 22 Function f (x) = x2 This is y = f (x) Only a demonstration.

Are typeset as a list. This is the reason why the vertical space is defined by the length registers for a list, especially \topsep, instead of \abovedisplayskip and \belowdisplayskip. This doesn’t effect the eqnarray environment. 5 Vertical whitespace Inside math expressions \\[] This works inside the math mode in the same way as in the text mode. \jot \jot The vertical space between the lines for all math expressions which allow multiple lines can be changed with the length \jot, which is predefined as \newdimen\jot \jot=3pt The following three formulas show this for the default value, \setlength\jot{0pt} and \setlength\jot{10pt}.