1. Designing a Proof GUI for Non-Experts Evaluation of an Experiment Martin Homik, Andreas Meier Presentation by Christoph Benzmüller UITP 2005, Edinburgh ActiveMath Group German Research Center for Artificial Intelligence DFKI GmbH, Saarbrücken
8. Textbook Example: √2 is irrational „ Assume that √2 is rational. Then, there are integers n,m that satisfy √2= n / m and that have no common divisors. From √2= n / m follows that 2* m 2 = n 2 (1), which results in the fact that n 2 is even. Then, n is even as well and there is an integer k such that n =2* k . The substitution of n in (1) by 2* k results in 2* m 2 =4* k 2 which can be simplified to m 2 =2* k 2 . Hence, m 2 and m are even as well. This is a contradiction to the fact that n,m are supposed to have no common divisor.“
17. Group C: Masking Operator Names Proof presented as trees of statements Edges = Story tellers „next do … to get … √ 2 is irrational √ 2 is rational m n: √ 2=m/n m, n are coprime
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20. Group D: Operator Application √ 2 is irrational We assume: √ 2 is rational There exist two numbers n and m in Z, Being coprime, such that √2=n/m 2m=n 2 n 2 is even n is even Search List all