*Post by Adam Funk*$0{\leq}x<i$

produces a lot more space on both sides of the "<" than around the "?"

--- is that normal? I can fix it adequately with this

$0{\leq}x\!<\!i$

but even that has slightly more space around the "<" than around the

"?". Is there a right way to make them match?

For consistency, one should always have the same space around

all relation symbols. The space that TeX uses for this is

called \thickmuskip, normally set to "5mu plus 5mu" (a stretchable

length).

You can set \thickmuskip = 0mu to make it disappear completely

from all relation symbols. This is almost certainly a bad idea

as it can confuse a reader trying to parse your formulas

The unit "mu" that is used for this space has a value of

one-eighteenth of a \quad. It is defined this way so that it

will automatically adjust to being used in subscripts, where

the fonts and therefore the \quad, are smaller.

In very rare circumstances one might want a one-time use of

a smaller space. In this case Ulrike's solution can be used.

The braces causes 0mu of space to be used (usually). You can

then manually add a little more if that is too cramped.

Dan

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