A combinatorial invariant that characterizes normal immersions of S\(^1\) into R\(^2\)
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Publication:1843254
DOI10.1215/S0012-7094-74-04115-5zbMATH Open0281.57019MaRDI QIDQ1843254
Publication date: 1974
Published in: Duke Mathematical Journal (Search for Journal in Brave)
Planar graphs; geometric and topological aspects of graph theory (05C10) Surfaces in Euclidean and related spaces (53A05) Embeddings in differential topology (57R40)
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