*** closed: answered my own question, but forum won't let me delete the thread, complains when I try ***
I posted a question asking why I was unsuccessful about redirecting both "www.mydomain..." and "mydomain..." forms of an old page to a new page within the same domain, using:
redirect 301 "/a directory/article.html" /main/2002/08/31/wp-permalink-to-article
I had to add another line:
redirect 301 "www.mydomain.com/a directory/article.html" /main/2002/08/31/wp-permalink-to-article
That made both work (the second form alone wouldn't make both work--oddly,it would still only work for the www-less version).
I figured out that if I redirected to the full path ("http://www.mydomain...") that both forms work.