A tie is the character ~
. It behaves as a
normal interword space in all respects except
that the line-breaking algorithm will never break a
line at that point. Thus
0.1
Dr. Seuss should be typed as Dr.~Seussfor this makes sure that LATEX will never leave the `Dr' at the end of one line and put the `Seuss' at the beginning of the next.
One should try to get in to the habit of typing ties first-time, not after waiting to see if LATEX will make a poor choice This will allow you to make all sorts of changes to your text without ever having to go back and insert a tie at a point that has migrated to the end of a line from the middle of a line as a result of those changes. Remember, of course, that the line-breaks
Here are some more examples of places where you should remember to place ties.
0.1
Chapter~
10 Donald~
E. Knuth
Appendix~
C width~
2
Figure~
1 function~
f
Theorem~
2 1,~
2, or~
3
Lemmas 3 and~
4 equals~
5