Source: wikibot/casson-invariant
= Casson invariant
{wiki=Casson_invariant}
The Casson invariant is an important concept in the field of 3-manifold topology, particularly in relation to the study of oriented homology 3-spheres. It is a topological invariant associated with a 3-manifold that provides a measure of the manifold's structure, particularly focusing on the presence of certain types of surfaces and knots within the manifold.