| Preface | 6 |
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| References | 7 |
| School years | 7 |
| Contents | 9 |
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| The Authors | 11 |
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| Introduction | 14 |
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| 0.1 Challenging: a human activity | 14 |
| 0.2 Challenges and education | 16 |
| 0.3 Debilitating and enabling challenges | 18 |
| 0.4 What is a challenge? | 18 |
| References | 22 |
| Challenging Problems: Mathematical Contents and Sources | 23 |
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| 1.1 Introduction | 23 |
| 1.2 Challenges within the regular classroom regime | 24 |
| 1.2.1 Challenge from observation | 26 |
| 1.2.2 Challenge from a textbook problem | 27 |
| 1.2.3 Increasing fluency with fractions | 28 |
| 1.2.4 Engaging with algebra | 29 |
| 1.2.5 Pedagogies to help development | 31 |
| 1.2.6 Combinatorics | 31 |
| 1.2.7 Geometry | 32 |
| 1.2.8 Other settings for school challenges | 34 |
| 1.3 Challenges in popular culture | 38 |
| 1.3.1 Another schoolyard problem | 40 |
| 1.3.2 A Russian problem | 40 |
| 1.3.3 The Microsoft problem | 41 |
| 1.3.4 A problem from children s literature | 42 |
| 1.3.5 A probabilistic element | 43 |
| 1.3.6 Concluding comments | 43 |
| 1.4 Challenges from inclusive and other teacher-supported contests | 43 |
| 1.4.1 Diophantine equations | 44 |
| 1.4.2 Pigeonhole principle | 45 |
| 1.4.3 Discrete optimization and graph theory | 46 |
| 1.4.4 Cases | 47 |
| 1.4.5 Proof by contradiction | 47 |
| 1.4.6 Enumeration | 48 |
| 1.4.7 Invariance | 49 |
| 1.4.8 Inverse thinking | 49 |
| 1.4.9 Coloring problems | 50 |
| 1.4.10 Concluding comments | 51 |
| 1.5 Challenges from Olympiad contests: Students independent of classroom teacher | 51 |
| 1.6 Content and context | 57 |
| 1.6.1 Three groups of requirements for assignments | 57 |
| 1.6.2 Challenges in classrooms: identifying patterns in their appearance | 59 |
| 1.6.3 The psychology of the art of writing problems as a research problem | 60 |
| 1.6.4 Using different areas of mathematics in different contexts | 60 |
| 1.6.5 The structure of problems and the form of their presentation as a means of responding to context and transforming it | 61 |
| 1.6.6 The issue of mathematics teacher education | 61 |
| 1.6.7 Conclusion | 62 |
| References | 62 |
| Challenges Beyond the Classroom-Sources and Organizational Issues | 64 |
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| 2.1 Introduction | 64 |
| 2.1.2 Working as individuals and in teams | 66 |
| 2.1.2 Involvement of teachers | 66 |
| 2.2 Environments for challenging mathematics | 66 |
| 2.2.1 Mathematics competitions | 68 |
| 2.2.1.1 Inclusive competitions | 70 |
| 2.2.1.2 Different types of competition | 71 |
| 2.2.1.3 Some general comments | 74 |
| 2.2.2 Mathematics journals, books and other published materials (including Internet) | 75 |
| 2.2.3 Research-like activities, conferences, mathematics festivals | 77 |
| 2.2.3.1 Jugend Forscht (youth quests), Germany and Switzerland | 78 |
| 2.2.3.2 Research Science Institute (RSI), USA | 78 |
| 2.2.3.3 High School Students Institute for Mathematics and Informatics, Bulgaria | 79 |
| 2.2.3.4 Mathematics festivals, Iran | 80 |
| 2.2.4 Mathematical exhibitions | 80 |
| 2.2.4.1 Historical background | 81 |
| 2.2.4.2 Examples of exhibitions | 83 |
| 2.2.5 Mathematics houses | 86 |
| 2.2.6 Mathematics lectures | 87 |
| 2.2.7 Mentoring mathematical minds | 88 |
| 2.2.8 Mathematics camps, summer schools | 88 |
| 2.2.8.1 International Mathematics Tournament of Towns summer camp | 89 |
| 2.2.8.2 International mathematics kangaroo summer camps | 89 |
| 2.2.8.3 Summer School Festival UM+ | 89 |
| 2.2.8.4 The Canadian seminar | 89 |
| 2.2.8.5 Isfahan summer camps | 90 |
| 2.2.8.6 The Institute for Advanced Study in USA | 90 |
| 2.2.9 Correspondence programs | 90 |
| 2.2.10 Web sites | 93 |
| 2.2.11 Public lectures, columns in newspapers, magazines, movies, books, general purpose journals | 93 |
| 2.2.12 Math days, open houses, promotional events for school students at universities | 94 |
| 2.2.13 Mathematics fairs | 94 |
| 2.2.13.1 Canadian Andy Liu model | 95 |
| 2.2.13.2 A mathematical house for younger children (Years 1 to 5) | 95 |
| 2.2.13.3 Mathematics day at universities | 95 |
| 2.2.13.4 Long night of mathematics at the high school, Karlsruhe | 96 |
| 2.2.13.5 India | 96 |
| 2.2.14 Mathematical quizzes | 96 |
| 2.2.14.1 The mathematical organization Archimedes | 97 |
| 2.3 Concluding remarks: challenging infrastructure-a powerful motivational factor | 97 |
| 2.4 Appendix | 98 |
| 2.4.1 Iran: what is a Mathematics House? | 99 |
| 2.4.1.1 History | 99 |
| 2.4.1.2 Audiences | 100 |
| 2.4.1.3 Activities | 100 |
| 2.4.1.4 Activities for high school students | 101 |
| 2.4.1.5 Activities for university students | 101 |
| 2.4.1.6 Activities for teachers | 101 |
| 2.4.1.7 Other activities | 102 |
| 2.4.1.8 Library | 102 |
| 2.4.1.9 Laboratories | 102 |
| 2.4.1.10 Achievements | 102 |
| 2.4.2 Serbia: the mathematics organization Archimedes | 103 |
| 2.4.2.1 Activities | 103 |
| 2.4.2.2 Lessons learned | 104 |