... styles.11
However, small changes in the document styles would make font changes a bit faster.
... leading''22
This is pronounced ``ledding'' and measures the distance between the baselines of succeeding lines. To TEX users it is known as baselineskip.
... system.33
Among the AMS distribution an example style option `concrete.sty' is provided which makes the Concrete roman as well as the Euler math fonts available. These fonts were used to typeset [4] and this article.
... shape.44
For full details of the usage of these primitive commands see the article about the basic macros [5].
... command.55
Actually we also said size10\string13pt\string to establish a larger baselineskip.
... respectively.66
This was suggested by Sebastian Rahtz who was one of the first users of our prototype version.
... mode,77
This is done with the command
 mathversion〈version name〉\string.
... version.88
Actually we cheated a bit more in this article: we had to reset the mathcode of certain characters because they are in different places in the Euler version. A few more details can be found in Don Knuth's article [3]. However, this is not a real problem because such changes can be done in commands similar to boldmath if such incompatible versions are to coexist in real applications.
... force.99
This means that it is the default (see next section).
... work.1010
YOU might belong to this group!
... preloaded.1111
This is the absolute minimum. These fonts are accessed by lplain.tex and latex.tex when the format is generated.
... file.1212
The latter alternative might be better if you use these fonts very rarely (e.g., at sites with many users) to avoid filling TEX's memory with unnecessary definitions.
... defined.1313
By the way, such documents were at no time portable since Leslie Lamport stated that it was always permissible to customize lfonts.tex according to the local needs. Therefore this is not an incompatible change.