# New pages

- 12:06, 28 March 2019 Stiefel-Whitney characteristic classes (hist) [1,623 bytes] Askopenkov (Talk | contribs) (Created page with " {{Stub}} == Definition == <wikitex>; Let $N$ be a compact smooth $n$-manifold (possibly with boundary). Denote by $PD=PD_G:H^k(N;G)\to H_{n-k}(N,\partial N;G)$ the Poincaré...")