相传,在狄拉克上学的一所英国学校里,有一位老师在一节课上给自己的学生出了一道奇怪的问题.下面是用火柴摆成的一个错误的等式:老师要求他的学生们,移动最少根数的火柴棒,使它成为一个真正的等式.结果,学生们很快找到了几种移动4根火柴棒使之相等的办法;接着,又有学生找到了只要移动3根火柴便能成立的等式. According to legend, a teacher at a British school where Dirac attended his school gave a strange question to his students in the following lesson: The following is a wrong equation in a match: The teacher asks his student We move the minimum number of match sticks to make it a true equation, and as a result, students quickly find several ways to move four sticks to make them equal; then, again, students find that as long as they move 3 Root matches can be established equation.