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...dir/.INBOX/.imap.index: index.next_uid (129) > uid_rec.uid (128) dovecot version: 0.99.13-3 Debian sid) I use dovecot in combination with mutt, procmail and postfix. If I rename the last received mail I can use my inbox folder again (until the next time the index gets corrupted). Debian bug# 294284 -- make install, not war

The book "Numerical Recipes in Fortran77" by Press, Teukolsky, Vetterling and Flannery describes a way to "pack" the even and odd coordinates of a real vector "R" into a complex vector "C" of half the length. Then using various FFT symmetries, they extract the FFT of "R" from the FFT of "C" which is half the length of "R",