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http://dx.doi.org/10.7468/jksmee.2011.25.2.323

A study on the pre-service teacher's recognition and fallacy for a number with irrational exponent  

Lee, Heon-Soo (Dept. of Math., Chonnam National University)
Park, Hyung-Bin (Dept. of Math. Education, Mokpo National University)
Bea, Kang-Soo (Mokpo High School)
Publication Information
Communications of Mathematical Education / v.25, no.2, 2011 , pp. 323-339 More about this Journal
Abstract
The expansion of exponential law as the law of calculation of integer numbers can be a good material for the students to experience an extended configuration which is based on an algebraic principle of the performance of equivalent forms. While current textbooks described that exponential law can be expanded from natural number to integer, rational number and real number, most teachers force students to accept intuitively that the exponential law is valid although exponent is expanded into real number. However most teachers overlook explaining the value of exponent of rational number or exponent of irrational number so most students have a lot of questions whether this value is a rational number or a irrational number. Related to students' questions, most teacher said that it is out of the current curriculum and students will learn it after going to college instead of detailed answers. In this paper, we will present several examples and the values about irrational exponents of a positive rational and irrational exponents of a positive irrational number, and study the recognition and fallacy of would-be teachers about the cases of irrational exponents of a positive rational and irrational exponents of a positive irrational number at the expansion of exponential law.
Keywords
expansion of exponential law; a number with irrational exponent; pre-service teacher; teacher's expertise;
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Times Cited By KSCI : 4  (Citation Analysis)
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