數學資料庫生日會

3 月 13 日（星期日）是數學資料庫的生日的前一天！如此大日子，我們安排了一連串的活動，大家萬勿錯過！

• 當天下午數學資料庫將舉辦 academic seminar（詳情快將在此公佈）。
• 當天晚上是數學資料庫的週年晚宴暨生日會，安排如下：

時間：7時閧始入席；下午 7 時半開始晚餐
地點：水瓶座咖啡室（旺角花園街2-16號好景商業中心3樓）
收費：中學生 -- 90 元
　　　其他　 -- 100 元

預先登記每位減收 10 元*
除了豐富的自助美食外，當晚更設有遊戲活動和幸運大抽獎，有機會贏得數學資料庫神秘大獎！機會難逢，快跟朋友一起電郵至 mathdb.fomd@gmail.com 報名吧！

* 需於 3 月 6 日（星期日）下午 8 時前連同姓名、人數（中學生和非中學生人數）和聯絡電話電郵至 mathdb.fomd@gmail.com，我們將以電話回覆作實。

香港中文大學公開講座

數學與哈利波特的隱形斗篷!

如果你看過電影《哈利波特》, 你應該見識過隱形斗篷的魔力, 怎樣把哈利隱形以及協助他逃過一幕又一幕的險境。究竟隱形斗篷可否在現實中出現呢？我們將以數學解答這個有趣的問題。

• 講者：鍾子信教授
• 日期：2011 年 2月26日 (星期六)
• 時間：上午 10:30 至 中午 12:00
• 地點：香港中文大學邵逸夫堂
• 語言：粵語

http://www.math.cuhk.edu.hk/publect/lecture20/lecture20.html

第十屆培正數學邀請賽初賽題目及答案

中一
http://www.mathdb.org/resource_sharing/others/s_puiching10_H1.pdf

中二
http://www.mathdb.org/resource_sharing/others/s_puiching10_H2.pdf

中三
http://www.mathdb.org/resource_sharing/others/s_puiching10_H3.pdf

中四
http://www.mathdb.org/resource_sharing/others/s_puiching10_H4.pdf

中五
http://www.mathdb.org/resource_sharing/others/s_puiching10_H5.pdf

答案
http://www.mathdb.org/resource_sharing/others/s_puiching10_HA.pdf

2011網上數學資源設計比賽(OMRC)

覺得平日數學課本內容不夠挑戰性？
覺得自己能創造更漂亮的證明？
在平常生活中見到很多的「數學」？

那麼你就要留意由數學資料庫和香港資優教育學院合辦的「2011網上數學資源設計比賽」!


比賽的網上報名平台已經開始接受提交作品，詳情請參閱:
http://hkage.org.hk/b5/sz_programmes.html?tab1=2&mac=open


你還不快把握這次的機會發揮你的數學小宇宙！

MD Academic Seminar (updated)

數學資料庫於一月舉行的 academic seminar 的詳情如下 :

日期 : 2011 年 1 月 9 日 ( 星期日)
時間 : 下午 4 時 30 分至 6 時
地點 : 香港理工大學 (Rm : R407)
講者 : 張潤權先生 (New York University)

==========================================================

Combinatorics - A Bit More Than Counting

Among Mathematics graduate students, some of them have never heard the word "Combinatorics". Even in a graduate class of Combinatorics, the professor, a star in the area, said that he could not really define what is Combinatorics. Field Medalist Terrence Tao claimed that Combinatorics may be the only exceptional area in modern Mathematics research. There are many areas in Mathematics related to Combinatorics, e.g. algebraic combinatorics, analytic combinatorics, probabilistic combinatorics, combinatorial geometry, combinatorial number theory, combinatorial algorithms, combinatorial design.

These facts seem contradicting as the subject of huge coverage is unaware by some of the reasearchers in Mathematics. That is Combinatorics. Not until recently Combinatorics is not covered in Hong Kong public examination syllabus, while it includes concepts like permutations and combinations in the core syllabus. I am going to talk about the interesting side of Combinatorics in this seminar.

MD Academic Seminar

數學資料庫於一月舉行的 academic seminar 的詳情如下：

日期：2011 年 1 月 9 日（星期日）
時間：(稍後公佈)
地點：香港理工大學
講者：張潤權先生（New York University）

=====================================================

Combinatorics - A Bit More Than Counting

Among Mathematics graduate students, some of them have never heard the word "Combinatorics". Even in a graduate class of Combinatorics, the professor, a star in the area, said that he could not really define what is Combinatorics. Fields Medalist Terrence Tao claimed that Combinatorics may be the only exceptional area in modern Mathematics research. There are many areas in Mathematics related to Combinatorics, e.g. algebraic combinatorics, analytic combinatorics, probabilistic combinatorics, combinatorial geometry, combinatorial number theory, combinatorial algorithms, combinatorial design.

These facts seem contradicting as the subject of huge coverage is unaware by some of the researchers in Mathematics. That is Combinatorics. Not until recently Combinatorics is not covered in Hong Kong public examination syllabus, while it includes concepts like permutations and combinations in the core syllabus. I am going to talk about the interesting side of Combinatorics in this seminar.

Polynomial roots

An elementary problem seen from other site.

Let be a polynomial with odd integral coefficients,

show that it cannot have rational root.