Graduation Thesis 2 is a continuation of Graduation Thesis 1, where we are studying knot theory. Knot Theory plays a role
in theoretically building the foundation of society, and contribute to the development of applied research. Recently, it has
been used for research on application to materials, and has become possible to create polymer compounds having a structure
of knots or links such as topological supramolecules. It is expected that knot theory can be used for the development of new
materials in the future. In this subject, as a continuation of the study in Graduation Thesis 1, we study properties of knots,
links, and space graphs using strong invariants such as polynomial invariants.