希布隆(Heilbron)型问题的研究成果,屡见报道,杨之老师在文[1]中列为whc64:平面上给定n个点,其中任三点可构成一个三角形,有一个最大面积与最小面积的比为un,求un的最小值(下确界,记为infun).2000年作者用初等方法证明了un+1 ≥un,u6 ≥3,u7 ≥ 3(见文[4] )2001年作者在文[ Heilbron-type problems have often been reported. Professor Yang Zhi was listed as whc64 in the article [1]: Given n points on a plane, any three points can form a triangle with a maximum area. The ratio to the minimum area is un, and find the minimum value of the un (under the bounds, denoted as infun). In 2000, the author used the elementary method to prove that un+1 ≥un, u6 ≥3, and u7 ≥ 3 (see [4] ) The author of the article in 2001