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本文的目的是指出:怎樣藉助於簡單的自製的數學儀器,可以很清楚地而容易瞭解地來說明數列極限的概念,我們假定學生們已熟習數軸上輸的表示法,數列的概念及數的隔開的概念。 儀器的一般樣子描繪於圖1.儀器由三部分構成,第一部分是塗以白漆的木板,其長寬為116厘米×20厘米厚度為1-1.5厘米離上邊4-5厘米處刻一缺口,其寬為1-2毫米,長為100厘米,使其兩端尚餘8厘米未切開,木板的上邊釘兩個環,在課堂內示教時可以懸掛。 儀器的第二部分是兩個游標:用洋鐵皮剪成带有凸出尖頭的“T字”形狀、並且在鐵片的水平部分釘上一塊0.5厘米厚的矩形木墊而製成,在遊標的矩形部分對角綫交點處釘上一個2厘米
The purpose of this paper is to point out how the concept of sequence limits can be explained clearly and easily with the aid of a simple, self-made mathematical instrument. We assume that students are familiar with the representation of numbers on the axis, the concept of numbers, and the number of Separated concept. The general appearance of the instrument is depicted in Figure 1. The instrument consists of three parts. The first part is a wood board painted white with a width of 116 cm x 20 cm and a thickness of 1-1.5 cm. A notch is cut 4-5 cm from the top. Its width is 1-2 mm and its length is 100 cm, leaving 8 cm at both ends not cut, with two rings on top of the board, which can be hung during teaching in the classroom. The second part of the instrument consists of two cursors: a guillotine cut “T” shape with a protruding tip and a 0.5 cm thick rectangular wooden mat nailed to the horizontal part of the iron plate. A 2cm nail is placed at the diagonal intersection of the rectangular part of the cursor