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An early result of González-Acuña is that a group G is the homomorphic image of some knot group if and only González-Acuña, F., Homomorphs of knot groups, Annals of Mathematics. — “Francisco Javier González-Acuña - Wikipedia, the free”, en.wikipedia.org
The authors were investigating cyclohexane conformations including endocyclic and exocylic double bonds when they noticed certain Strained Homomorphs. 14. General Summary". J. Am. Chem. Soc. 75 (1). — “Allylic strain - Wikipedia, the free encyclopedia”, en.wikipedia.org