On normal Euler numbers of embedding \({\mathbb{P}{}}{\mathbb{R}{}}^ 2\) in indefinite 4-manifolds

zbMath0765.57013MaRDI QIDQ1203890

Hongzhu Gao

Publication date: 18 February 1993

Published in: Chinese Science Bulletin (Search for Journal in Brave)

zbMATH Keywords

embeddinghomology classnormal Euler class

Mathematics Subject Classification ID

Embeddings and immersions in topological manifolds (57N35)

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