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This paper presents a combination of several automated reasoning and proofpresentation tools with the Mizar system for formalization of mathematics. Thecombination forms an online service called MizAR, similar to the SystemOnTPTPservice for first-order automated reasoning. The main differences toSystemOnTPTP are the use of the Mizar language that is oriented towards humanmathematicians (rather than the pure first-order logic used in SystemOnTPTP),and setting the service in the context of the large Mizar Mathematical Libraryof previous theorems,definitions, and proofs (rather than the isolated problemsthat are solved in SystemOnTPTP). These differences poses new challenges andnew opportunities for automated reasoning and for proof presentation tools.This paper describes the overall structure of MizAR, and presents the automatedreasoning systems and proof presentation tools that are combined to make MizARa useful mathematical service.

Automated Reasoning and Presentation Support for Formalizing Mathematics in Mizar