Abstract
Counter-examples, which are a distinct kind of example, have a functional role in inducing logically deductive reasoning skills in the learning process. In this investigation, we compare the ability of students and prospective teachers in South Korea and Hong Kong to use counter-examples to justify mathematical propositions. The results highlight that South Korean students performed better than Hong Kong students at justifying propositions using counter-examples in algebra problems, but both did equally well in geometry problems. In terms of the prospective teachers’ ability to justify propositions using counter-examples in two particular topics, properties of the absolute value function and parallelogram, Hong Kong prospective teachers performed relatively weakly in the absolute value problem but better in the parallelogram problem compared with South Korean prospective teachers. The weaknesses and strengths of students and prospective teachers in generating counter-examples associated with logical reasoning in mathematical contexts in the two regions indicate ways of improving the effectiveness of learning and teaching mathematics through the use of counter-examples.
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The research project is supported by the Special Project Grant funded by the Hong Kong Institute of Education: FAS/0508/MSST/09.
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Appendices
Appendix 1
1.1 Item questions for students
Determine whether the following statements are true or false. If the statement is true, then explain the reason. If the statement is false, then provide a counter-example and explain why it is a counter-example.
Appendix 2
2.1 Item questions for prospective teachers
Determine whether the following students’ answers are correct or incorrect. Put a “✓” or “×” to indicate your judgment of the students’ initial answer of ‘true’ or ‘false’. If you decide that the student’s answer is incorrect, explain the reason. Explain your teaching method to get students to give the correct answer.
Appendix 3
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Leung, I.K.C., Lew, Hc. The ability of students and teachers to use counter-examples to justify mathematical propositions: a pilot study in South Korea and Hong Kong. ZDM Mathematics Education 45, 91–105 (2013). https://doi.org/10.1007/s11858-012-0450-x
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DOI: https://doi.org/10.1007/s11858-012-0450-x