Chain functors and homology theories -- A generalization of the whitehead theorem -- Some problems on numerical homotopy invariants -- Unstable divisibility of the chern character -- Sphere bundles over spheres and non-cancellation phenomena -- On the algebra BP* (BP) -- Surgery, BPL, BTOP and the PL bordism rings -- The genus of an H โ{128}{148} space -- Bockstein spectral sequences, modified bockstein spectral sequences, and hopf algebras over certain frobenius rings -- Nearly frobenius algebras and their module categories -- Loop structures on the homotopy type of S3 -- Sphere bundles over spheres as H-spaces mod p>2