\pmb command turns on poor man's bold. It works by duplicating its argument slightly offset, giving a bold effect (at least in the horizontal direction); doesn't work well for horizontal lines, like - or +.

EXAMPLE

```
a \pmb a \boldsymbol a
```
$ a \pmb a \boldsymbol a $
```
\pmb{a+b-c}\ \ a+b-c
```
$ \pmb{a+b-c}\ \ a+b-c $