A Descriptive Study on Progressof 8th Graders' ProofConception in School Mathematics of Japan
Project/Area Number  07801035 
Research Category 
GrantinAid for Scientific Research (C)

Section  一般 
Research Field 
Educaion

Research Institution  Shinshu University 
Principal Investigator 
MIYAZAKI Mikio Shinshu University, Faculty of Education, Assistant Professor, 教育学部, 助教授 (10261760)

Project Fiscal Year 
1995 – 1996

Project Status 
Completed(Fiscal Year 1996)

Budget Amount *help 
¥2,000,000 (Direct Cost : ¥2,000,000)
Fiscal Year 1996 : ¥700,000 (Direct Cost : ¥700,000)
Fiscal Year 1995 : ¥1,300,000 (Direct Cost : ¥1,300,000)

Keywords  proofconception / relative / truth / 8th grade / school mathematics / 証明観 / 相対的 / 真理 / 中学2年 / 学校数学 / 証明 / proof / 相対的真理観 
Research Abstract 
The study finally aims to describe the progress of 8th graders' proofconception by proof instructions based on relative concept of truth in mathematics in Japan. The aim involves the following goals. Goal 1 : Clarifying the theoretical background to developmaterials for proof instruction based on relative concept of truth in mathematics. Goal 2 : Developing materials for proof instruction based on relative concept of truth in mathematics. Goal 3 : Collecting data of some small groups of 8th grader throughout proof instruction based on relative concept of truth in mathematics by natural observation. Goal 4 : Describing the progress of 8th graders' proofconception by analyzing the data by sociological / psychological method. Regarding Goal 1, I discussed the following points. Discussion 1a : Background & significance of relative concept of truth in mathematics. Discussion 1b : Movement of curriculum in school mathematics of Japan. Discussion 1c : Introduction of proof in textbooks of junior
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high school mathematics in Japan. Discussion 1d : Conceptions of truth of a proposition in proof instruction following tectbooks of junior high school mathematics in Japan. As to Discussion 1c, I got the following conclusion. In textbooks of junior high school mathematics in Japan, there is no consistency between regulations of argument in a definition of proof and a set of arguments of proof, or we cannot judge whether there is a consistency or not. As a reason of no consistency, One criterion of correctness (correspondenceto facts students can acquire) is applied for a proposition before the field of geometry in 8th grade, and the other criterion (coherence to comewhat assumptions) is applied intentionally for the same proposition in the field. Furthermore, the application of two criterions is causedby adapting not only justification or explanation as functions of proof, but also local systemization of the propositions learned before the field of geometry in 8th grade. As to Discussion 1d, I got the following conclusion. Regarding the meaning of truth, two conceptions is possible to brought up : the applicability of propositions in the range students can recognize, and the dependence of their truth on the proved propositions. Regarding the criterion of truth, the following conception is possible to be brought up : it is preestablished which criterion should be applied to a proposition, the correspondence to the facts students can recognize or the deduction from assumptions under the preestablished distinction of usage. Less

Report
(4results)
Research Output
(7results)