* Bruno Buchberger and Tudor Jebelean RISC Linz, Austria Theorema: Application of Mathematica for Proof Training The Thereoma Project at the Research Institute for Symbolic Computation aims at expanding computer algebra systems by computer-support for mathematical proving. The present version of Theorema is based on Mathematica 3.0. One of the possible applications of Theorema is computer-supported education in the art of proving. In fact, it seems that systematic proof training is a problem in most of the math and computer science curriculua worldwide. The reason for this is twofold: First, proof training needs an extensive individual interaction between teacher and student and, hence, is too time-consuming for being considered in the curricula. Second, the proof formalisms developed in logic books are not sufficient and too little specific as an introduction and basis for practical proof training and very little material is available on systematic proof techniques for the various special areas of mathematics. The Theorema project emphasizes the automatic generation of the (routine parts of) mathematical proofs in natural language and in a well structured form that imitates human proving in the various areas of mathematics. Thus, the provers developed in the frame of the Theorema project lend themselves to be used as a computer-based training tool for teaching students the art of proving. In the talk we report on first experiences of using the Theorema software for supporting our proof training courses, which we organize at RISC as a part of our diploma and PhD program and also on a similar teaching experiment using Theorema in an intensive course at the Hirshima University.