#print
One thing to keep in mind is that outside of
$ signs, spaces are significant just as they
were before.  Inside $ signs, spaces are significant
only as delimiters, and will not add any space
to the output.
Furthermore, inside delimiters, new lines also
don't matter, just as they didn't matter between
the .EQ and .EN.

Do the lines

Let $alpha$ be the size of the vector $pi$.

and

Let $ alpha $ be the size of the vector $ pi $.

produce the same output?
Answer yes or no.
#copyin
#user
#uncopyin
#match yes
#log
#next
6.1d 10