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Tarski_Mereogeometry is a Coq library created by R. Dapoigny and P. Barlatier whose purpose is to implement the mereogeometry of Stanislaw Lesniewski. It is the second part of a project using the Coq language and called KDTL (Knowledge-based Dependently Typed Language) to build an alternative to Description Logics. The primary objective is to provide a basis for spatial reasoning without using any connection primitive as in mereotopology. The developed library is a theoretical construct which relies on three axioms and on a small set of definitions. The last axiom of Tarski’s version is provable from definitions according to the Lesniewski’s spirit.