[tex-k] TeXbook: space -> control space

[Igor Liferenko]

Hi,

In the following sentence from texbook.tex, `(instead of a space)'
should probably be
`(instead of a control space)':

    In fact, it's usually wise to type |~| (instead of a space) just
after a common
    abbreviation that occurs in the middle of a sentence.

I think in this sentence we opt between "tie" and "control space"
because if line ends on abbreviation it may be perceived as end of
sentence. And using "space" will almost always give bad result.

Regards,
Igor