more and more folks are getting themselves tonguetied these days
with the confusion of metatongues.  Instead, I will use the neologism
&quot;epiformula&quot; to describe things like e_3, restricting its use to what
I make explicit here, and by this epiformula to say we escape all the
mystifying connotations that have accumulated about the prefix &quot;meta&quot;.

o-----------------------------------------------------------o
| Epiformula e_3                                            |
o--------------------