Difference (from prior major revision)
(author diff)
Added: 40a41,42
Currently problems 1, 2, 3, 5, 10, 14, 21 are solved and 7, 8, 9 are not.(what about problems 4,6,11,12,13,15,16,17,18,19,20,21,22,23 ? PME link doesn't say anything about them or is vague)