Research of topological invariants of plane closed curves

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The mail purposes of this research are, firstly to obtain new topological invariants for closed plane curves, and secondly to investigate their geometric and algebraic properties.For the first purpose, we obtained two infinite series of topological invariants which are denoted by I^<epsilon>_<habeta> and St_k, where epsilon is +, 0 or -, and alpha, beta, and k vary over the set of all natural numbers.One of the important results of this research was to show the order in the sense of Vassiliev of the invariants I^<epsilon>_<habeta> to be equal to alpha + 1. Establishing the independence among those invariants, we have shown that there exist, for all finite order, infinitely many algebraically independent topological invariants.For the invariants St_k, investigating the jumps of their values at the unstable curves along regular deformations, we have verified the same geometric property as the strangeness invariants obtained by V.I.Arnold, and also algebraic independence among them as well as the additivity with respect to the connected sum operation of plane curves. We have also obtained a formula explaining the relation between I^<epsilon>_<habeta> and St_k.