Apparently, this user prefers to keep an air of mystery about them.
8 Hatcher Chapter $0$ Exercise $7$ sep 24
3 give the lists of elementary divisors for an abelian group of the specified order and match each list with corresponding list of invariant factors may 4 '13
2 Triangulation of Torus oct 1
2 Hatcher problem 1.2.12 jan 3