Another approach has been to investigate learners’ conceptions through geometricrepresentations of infinity, such as in the study of Fischbein, Tirosh and Melamed (1981) about middle school students’ intuitions. One of their tasks included comparing the cardinal of natural numbers with the number of points between 0 and 1 on the number line. The typical response: "there is an infinity of points on the line, and there is an infinity of natural numbers" (Fischbein et al., 1981, p. 506), and so the answer "the two sets must be equinumerous," is considered incorrect by the students. Tall’s (1980)research work was on a child’s view of the number of points contained in a straight line and in a segment, and Gimenez (1990) identified primary-school students’ difficulty to conceive the density concept.
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