(Q6056717)
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Wikipedia(3 entries)
- enwiki Intersection form of a 4-manifold
- jawiki 交叉形式 (4次元多様体)
- ruwiki Форма пересечений
symmetric bilinear form on the middle degree (co)homology group of an even-dimensional manifold
![{\displaystyle {\begin{aligned}&Q\colon \operatorname {H} ^{n}(M)\times \operatorname {H} ^{n}(M)\to \mathbb {Z} \\&Q\colon (\alpha ,\beta )\mapsto (\alpha \smile \beta )\frown [M]\end{aligned}}}](https://wikimedia.org/api/rest_v1/media/math/render/svg/2bc7cf16d6abf0c870c4645e8184dbff3b9b03ee)