| Budget Amount *help |
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2011: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2010: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2009: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
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| Research Abstract |
A handlebody-knot is a handlebody embedded in the 3-sphere. Two handlebody-knots are equivalent if one can be transformed into the other by an isotopy of the 3-sphere. A handlebody-knot is a natural generalization of a knot, and is closely related to a spatial graph and a 3-manifold. The results of this study are as follows : I defined a normalized Yamada polynomial. I provided methods to detect the irreducibility of a handlebody-knot by using quandle coloring invariants. I introduced the IH-complex on the set of spatial trivalent graphs, and evaluated the IH-distance by using invariants.
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