Clicking on these section numbers use to allow you to share your comments and thoughts about this section of Synergetics with everyone. In that way, Synergetics could grow and become more and more an educational resource.
This functionality was abused, so I have removed it.
But I have not removed these links. I am thinking about implementing this functionality in another way that would be less susceptible to abuse.
Until that day you will have to put up with this message, which, I know, is only a little better than a broken link.
Robert W. Gray