# Algebraic Gluing of Holomorphic Discs in K3 Surfaces and Tropical Geometry

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We will start from the motivation of the tropical geometry. Then

we will explain how to use Lagrangian Floer theory to establish the

correspondence between the weighted counting of tropical curves to the

counting of holomorphic discs in K3 surfaces. In particular, the result

provides the existence of new holomorphic discs which do not come easily

from direct gluing argument.