數學資料庫將於下星期舉行 academic seminar!詳情如下:
日期:2010 年 6 月 29 日(星期二)
時間:5:30 pm 至 6:30 pm
地點:香港中文大學邵逸夫夫人樓(Lady Shaw Building)232 室
講者:陳鍵行先生(University of Illinois at Chicago)
註:從港鐵大學站(中文大學出口)轉右,可乘坐中文大學校巴於潤昌堂下車,步行約兩分鐘即可抵達邵逸夫夫人樓。星期二的校巴於每小時 00、15、20、30、40、45 分在大學站開出,車程約 5 分鐘。
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《密碼攻防戰》
我們每天都需要與不同的人和網站交換數據,當中包括了很多秘密和需要保密的資料。我們如何以數學的方法保護傳送的資料,只讓特定的人閱讀它們?與此同時,它們又可如何破解?講座將深入淺出地介紹從古到今數學在密碼學裏的應用。
War of Encryption
We have to exchange data with many people and websites every day, in which they contain a lot of secrets and confidential information. How can we protect our transferred data with mathematics and only let authorized people read them? At the same time, how can they be cracked? We will discuss the use of mathematics in encryption from the ancient times to the modern world.
2010年6月22日 星期二
2010年2月28日 星期日
數學資料庫 academic seminar
數學資料庫於三月中舉行的 academic seminar 的詳情如下:
日期:2010 年 3 月 14 日(星期日)
時間:下午 4 時 30 分至 5 時 30 分
地點:香港城市大學教學樓 P4909 室(紫區)
講者:潘瑛小姐(香港大學數學系研究生)
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Finite Geometry and Combinatorics
Finite Geometry is a kind of Geometry which is often used in computer programming and design (a branch of statistics).
In Euclidean Geometry, we seldom use "counting" to solve a problem. However, in finite geometry, combinatorics plays an important role. Also, finite geometry helps to solve problems in combinatorics, such as the Kirkman's schoolgirl problem.
In this talk, we will introduce two important objects in Finite Geometry: finite projective planes and finite generalized quadrangles and use counting to see some interesting structures of them.
日期:2010 年 3 月 14 日(星期日)
時間:下午 4 時 30 分至 5 時 30 分
地點:香港城市大學教學樓 P4909 室(紫區)
講者:潘瑛小姐(香港大學數學系研究生)
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Finite Geometry and Combinatorics
Finite Geometry is a kind of Geometry which is often used in computer programming and design (a branch of statistics).
In Euclidean Geometry, we seldom use "counting" to solve a problem. However, in finite geometry, combinatorics plays an important role. Also, finite geometry helps to solve problems in combinatorics, such as the Kirkman's schoolgirl problem.
In this talk, we will introduce two important objects in Finite Geometry: finite projective planes and finite generalized quadrangles and use counting to see some interesting structures of them.
2009年12月19日 星期六
MD Academic Seminar
數學資料庫將於本月底舉行期待已久的 academic seminar! 詳情如下:
日期:2009 年 12 月 27 日(星期日)
時間:下午 4 時 30 分至 5 時 30 分
地點:香港大學莊月明文娛中心 302 室
講者:樊偉堂先生(華盛頓大學數學系博士研究生)
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Probability from a gambler's viewpoint --- A taste of Martingale Theory
Suppose you keep flipping a fair coin until 10 heads occur consecutively. How many times of flipping do you need on average?
We will solve this and other related problems as an application of the Optional Stopping Theorem. The basic notions and properties of discrete martingales will be introduced in an informal manner, with emphasis on the intuitive ideas.
Prerequisite: Basic probability in secondary school level.
日期:2009 年 12 月 27 日(星期日)
時間:下午 4 時 30 分至 5 時 30 分
地點:香港大學莊月明文娛中心 302 室
講者:樊偉堂先生(華盛頓大學數學系博士研究生)
=====================================================
Probability from a gambler's viewpoint --- A taste of Martingale Theory
Suppose you keep flipping a fair coin until 10 heads occur consecutively. How many times of flipping do you need on average?
We will solve this and other related problems as an application of the Optional Stopping Theorem. The basic notions and properties of discrete martingales will be introduced in an informal manner, with emphasis on the intuitive ideas.
Prerequisite: Basic probability in secondary school level.
2009年8月16日 星期日
MD Academic Seminar
數學資料庫將於本月底舉行期待已久的 academic seminar! 詳情如下:
日期:2009 年 8 月 30 日(星期日)
時間:下午 4 時 30 分至 5 時 30 分
地點:香港中文大學邵逸夫夫人樓(Lady Shaw Building)232 室(見註)
講者:楊葆霖先生(普林斯頓大學數學系博士研究生)
註:從港鐵大學站(中文大學出口)轉右,可乘坐中文大學校巴於第二個站(潤昌堂)下車,步行約兩分鐘即可抵達邵逸夫夫人樓。星期日的校巴於每小時 00、20、40 分在大學站開出,車程約 5 分鐘。
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講題:淺談拓撲--沒有長度的幾何
簡介:長度和角度都是幾何中常見的概念。可是如果我們只想探討物件的大約形狀(例如宇宙有多少個「洞」),我們並不真的需要討論長度與角度。拓撲學正是數學中探討這種問題的一門重要學科。講座將深入淺出地介紹拓撲學裏一些重要的概念和例子,並會討論一些初中常見的幾何定理跟拓撲學的關係。
講座適合初中或以上學生。
Topic: A leisurely introduction to topology: geometry without lengths
Abstract: Length and angles are common concepts in geometry. However, if one is only interested in the rough shape of an object (like how many "holes" there are in our universe), then these concepts are actually irrelevant. Topology is the branch of mathematics that studies these questions. In the talk, we shall introduce some useful notions and interesting examples in topology, and discuss how some common theorems in elementary geometry relates to topology.
The talk will be accessible to students in Form 1 or above.
日期:2009 年 8 月 30 日(星期日)
時間:下午 4 時 30 分至 5 時 30 分
地點:香港中文大學邵逸夫夫人樓(Lady Shaw Building)232 室(見註)
講者:楊葆霖先生(普林斯頓大學數學系博士研究生)
註:從港鐵大學站(中文大學出口)轉右,可乘坐中文大學校巴於第二個站(潤昌堂)下車,步行約兩分鐘即可抵達邵逸夫夫人樓。星期日的校巴於每小時 00、20、40 分在大學站開出,車程約 5 分鐘。
============================================================
講題:淺談拓撲--沒有長度的幾何
簡介:長度和角度都是幾何中常見的概念。可是如果我們只想探討物件的大約形狀(例如宇宙有多少個「洞」),我們並不真的需要討論長度與角度。拓撲學正是數學中探討這種問題的一門重要學科。講座將深入淺出地介紹拓撲學裏一些重要的概念和例子,並會討論一些初中常見的幾何定理跟拓撲學的關係。
講座適合初中或以上學生。
Topic: A leisurely introduction to topology: geometry without lengths
Abstract: Length and angles are common concepts in geometry. However, if one is only interested in the rough shape of an object (like how many "holes" there are in our universe), then these concepts are actually irrelevant. Topology is the branch of mathematics that studies these questions. In the talk, we shall introduce some useful notions and interesting examples in topology, and discuss how some common theorems in elementary geometry relates to topology.
The talk will be accessible to students in Form 1 or above.
2009年2月27日 星期五
圓周率日活動
3 月 14 日是圓周率日,也是數學資料庫的生日!如此大日子,我們安排了一連串的活動,大家萬勿錯過!
關於 academic seminar:
日期:2009 年 3 月 14 日(星期六)
時間:下午 4 時 15 分至 5 時 30 分
地點:香港城市大學 P4909 室(紫區)
講者:李靜文小姐(德國柏林大學博士研究生)
語言:粵語輔以英語
主題:從「什麼是數學研究」到「一個圖論的分類問題」
From "What is Mathematical Research" to "A Characterization Problem in Graph Theory"
簡介:
作為一名數學系的研究生,我被別人問得最多的問題可算是「數學究竟有什麼可以被研究呢?」。在這次研討會中,我會跟大家分享我在圖論裡的一個分類問題的研究 ---- 平面圖次序維度最大為2的分類,讓聽眾可一嘗數學研究的滋味。
本講座內容適合中學生。
As a graduate student in Mathematics, the most common question I have ever been asked is "What are there to be researched in Mathematics?". In this seminar, I will give the audience a taste of mathematical research by sharing my experience of working on a characterization problem in Graph Theory -- the characterization of planar maps with order dimension at most 2.
The content of this seminar is conceivable for secondary students.
- 當天上午有數學資料庫協辦的培正數學邀請賽決賽(詳見比賽網頁)。
- 當天下午數學資料庫將舉辦 academic seminar(詳見本文後段)。
- 當天晚上是數學資料庫的週年晚宴暨生日會,將有一系列的抽獎和遊戲活動(詳情快將在此公佈)。
關於 academic seminar:
日期:2009 年 3 月 14 日(星期六)
時間:下午 4 時 15 分至 5 時 30 分
地點:香港城市大學 P4909 室(紫區)
講者:李靜文小姐(德國柏林大學博士研究生)
語言:粵語輔以英語
主題:從「什麼是數學研究」到「一個圖論的分類問題」
From "What is Mathematical Research" to "A Characterization Problem in Graph Theory"
簡介:
作為一名數學系的研究生,我被別人問得最多的問題可算是「數學究竟有什麼可以被研究呢?」。在這次研討會中,我會跟大家分享我在圖論裡的一個分類問題的研究 ---- 平面圖次序維度最大為2的分類,讓聽眾可一嘗數學研究的滋味。
本講座內容適合中學生。
As a graduate student in Mathematics, the most common question I have ever been asked is "What are there to be researched in Mathematics?". In this seminar, I will give the audience a taste of mathematical research by sharing my experience of working on a characterization problem in Graph Theory -- the characterization of planar maps with order dimension at most 2.
The content of this seminar is conceivable for secondary students.
2008年12月14日 星期日
MD Academic Seminar
數學資料庫將於本月底舉行 academic seminar,詳情如下:
日期:2008 年 12 月 28 日(星期日)
時間:下午 4 時 30 分至 5 時 45 分
地點:香港科技大學 2304 室(近 17、18 號升降機)
講者:張潤權先生(香港科技大學數學系研究生)
語言:粵語輔以英語
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Topic: How "randomness" exists in our world
Abstract:
We will see what "randomness" is from a philosophical angle with some examples in mathematics, physics, computer science, psychology and finance, and hopefully we can get some idea to answer the hard problem "does randomness really exist in our world?". After that, we will focus on the use of probability theory in computer science for random variate generation.
日期:2008 年 12 月 28 日(星期日)
時間:下午 4 時 30 分至 5 時 45 分
地點:香港科技大學 2304 室(近 17、18 號升降機)
講者:張潤權先生(香港科技大學數學系研究生)
語言:粵語輔以英語
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Topic: How "randomness" exists in our world
Abstract:
We will see what "randomness" is from a philosophical angle with some examples in mathematics, physics, computer science, psychology and finance, and hopefully we can get some idea to answer the hard problem "does randomness really exist in our world?". After that, we will focus on the use of probability theory in computer science for random variate generation.
2008年8月28日 星期四
MD Academic Seminar
MD 今個星期日有 Academic Seminar:
日期:2008 年 8 月 31 日(星期日)
時間:下午 5 時至 6 時
地點:香港中文大學邵逸夫夫人樓(Lady Shaw Building)C1(見註)
語言:粵語輔以英語
註:從港鐵大學站(中文大學出口)轉右,可乘坐中文大學校巴於第二個站(潤昌堂)下車,步行約兩分鐘即可抵達邵逸夫夫人樓。星期日的校巴於每小時 00、20、40 分在大學站開出,車程約 5 分鐘。
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Topic: Matrix and Transformations
Speaker: Jessey Lin (undergraduate student at CUHK)
Abstract:
For those of you who are of first encounter with the matrix mathematically, you will get a glimpse of how this 'creature' is added, subtracted or multiplied. For those of you who are all too familiar with the matrix and its operations, it might be a good chance to refresh your memories of representing reflections, the principal axis theorem, and other geometric transformations which are often used in other branches of geometry. Welcome to all!
日期:2008 年 8 月 31 日(星期日)
時間:下午 5 時至 6 時
地點:香港中文大學邵逸夫夫人樓(Lady Shaw Building)C1(見註)
語言:粵語輔以英語
註:從港鐵大學站(中文大學出口)轉右,可乘坐中文大學校巴於第二個站(潤昌堂)下車,步行約兩分鐘即可抵達邵逸夫夫人樓。星期日的校巴於每小時 00、20、40 分在大學站開出,車程約 5 分鐘。
============================================================
Topic: Matrix and Transformations
Speaker: Jessey Lin (undergraduate student at CUHK)
Abstract:
For those of you who are of first encounter with the matrix mathematically, you will get a glimpse of how this 'creature' is added, subtracted or multiplied. For those of you who are all too familiar with the matrix and its operations, it might be a good chance to refresh your memories of representing reflections, the principal axis theorem, and other geometric transformations which are often used in other branches of geometry. Welcome to all!
2008年6月14日 星期六
MD Academic Seminar June 2008
今個月MD又開會,之後亦一如以往,有academic seminar;詳情如下:
題目:準確傳送的秘密--編碼學
TOPIC: The Secret of Accurate Transmission - Coding Theory
講者:陳鍵行先生(University of Illinois at Chicago)
SPEAKER: Mr Andy Chan (University of Illinois at Chicago)
日期:2008年6月21日(星期六)
DATE: June 21, 2008 (Sat)
時間:下午五時至下午六時十五分
TIME: 5pm--6:15pm
地點:香港城市大學 P4909 室(紫色區域四樓)
VENUE: Room P4909 (Purple Zone, 4/F) in City University of Hong Kong
歡迎任何對數學有興趣的人來聽講座。
Anyone who are interested in Mathematics are welcomed to this seminar.
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準確傳送的秘密--編碼學
現代資訊交流頻繁。簡單至手填表格,複雜至電腦以光纖傳送資料都是生活不可或缺的部分。我們可以怎樣利用數學減少傳遞訊息時出錯的機會?方法就是編碼學。講座將討論幾種常用的測錯和除錯方法,並簡介其背後的數學結構。
The Secret of Accurate Transmission - Coding Theory
Data transfer is frequent nowadays. It plays an important role in our daily life. It can be as simple as filling forms manually, or as complicated as data transmission between computers via optical fibres. How can we reduce errors during the course of transmission with mathematics? The method is coding theory! In the seminar, we will discuss several error-detecting and error-correcting methods. The mathematical structure behind will be introduced as well.
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講座流程:
1. 編碼學的用途
2. 最基本的例子:重覆編碼
3. 最常見的例子:檢測碼
4. 測錯距離及除錯距離
5. Hamming 碼
題目:準確傳送的秘密--編碼學
TOPIC: The Secret of Accurate Transmission - Coding Theory
講者:陳鍵行先生(University of Illinois at Chicago)
SPEAKER: Mr Andy Chan (University of Illinois at Chicago)
日期:2008年6月21日(星期六)
DATE: June 21, 2008 (Sat)
時間:下午五時至下午六時十五分
TIME: 5pm--6:15pm
地點:香港城市大學 P4909 室(紫色區域四樓)
VENUE: Room P4909 (Purple Zone, 4/F) in City University of Hong Kong
歡迎任何對數學有興趣的人來聽講座。
Anyone who are interested in Mathematics are welcomed to this seminar.
************************************************************************************************************************
準確傳送的秘密--編碼學
現代資訊交流頻繁。簡單至手填表格,複雜至電腦以光纖傳送資料都是生活不可或缺的部分。我們可以怎樣利用數學減少傳遞訊息時出錯的機會?方法就是編碼學。講座將討論幾種常用的測錯和除錯方法,並簡介其背後的數學結構。
The Secret of Accurate Transmission - Coding Theory
Data transfer is frequent nowadays. It plays an important role in our daily life. It can be as simple as filling forms manually, or as complicated as data transmission between computers via optical fibres. How can we reduce errors during the course of transmission with mathematics? The method is coding theory! In the seminar, we will discuss several error-detecting and error-correcting methods. The mathematical structure behind will be introduced as well.
-------------------------------------------------------------------
講座流程:
1. 編碼學的用途
2. 最基本的例子:重覆編碼
3. 最常見的例子:檢測碼
4. 測錯距離及除錯距離
5. Hamming 碼
2008年3月10日 星期一
MD Academic Seminar Mar 2008
繼去年十二月廿三日數學資料庫在香港大學舉辦academic seminar後,在接下來的三月十五日,我們在香港城市大學再舉辦academic seminar。詳情如下:
日期:2008 年 3 月 15 日(星期六)
時間:下午 3 時 至 下午 4 時
地點:香港城市大學 P 4902 室
講者:張婉琳小姐(香港中文大學)
講題:An introduction to Strong Conical Hull Intersection Property
簡介:
Strong Conical Hull Intersection Property (strong CHIP in short) is a geometric concept introduced in 1990’s for studying constrained convex optimization problems. In the seminar, a short account of its historical background, its mathematical formulation and its significance in recent researches on optimization will be given.
No specific prerequisites will be needed for the seminar.
REFERENCES:
1.
Deutsch, F. (1998): The role of the strong conical hull intersection property in convex optimization and approximation. In: Chui, Schumaker, eds., Approximation Theory IX, Vanderbilt University Press, Nashville, TN.
2.
Heinz H. Bauschke, Jonathan M. Borwein, Wu Li (1999): Strong conical hull intersection property, bounded linear regularity, Jameson's property (G), and error bounds in convex optimization. Mathematical Programming 86, 135-160
3.
Deutsch, F., Li, W., Ward, J.D. (1997): A dual approach to constrained interpolation from a convex subset of Hilbert space. J. Approx. Theory 90, 385-414
日期:2008 年 3 月 15 日(星期六)
時間:下午 3 時 至 下午 4 時
地點:香港城市大學 P 4902 室
講者:張婉琳小姐(香港中文大學)
講題:An introduction to Strong Conical Hull Intersection Property
簡介:
Strong Conical Hull Intersection Property (strong CHIP in short) is a geometric concept introduced in 1990’s for studying constrained convex optimization problems. In the seminar, a short account of its historical background, its mathematical formulation and its significance in recent researches on optimization will be given.
No specific prerequisites will be needed for the seminar.
REFERENCES:
1.
Deutsch, F. (1998): The role of the strong conical hull intersection property in convex optimization and approximation. In: Chui, Schumaker, eds., Approximation Theory IX, Vanderbilt University Press, Nashville, TN.
2.
Heinz H. Bauschke, Jonathan M. Borwein, Wu Li (1999): Strong conical hull intersection property, bounded linear regularity, Jameson's property (G), and error bounds in convex optimization. Mathematical Programming 86, 135-160
3.
Deutsch, F., Li, W., Ward, J.D. (1997): A dual approach to constrained interpolation from a convex subset of Hilbert space. J. Approx. Theory 90, 385-414
2007年12月17日 星期一
MD Academic Seminar Dec 2007
自去年開始,MD每次開會後都幾乎有academic seminar,邀請MD會員或其他朋友就不同的數學課題作講座。以後每次academic seminar都會在這裏賣廣告啦!
日期:2007 年 12 月 23 日(星期日)
時間:下午 2 時 30 分至 3 時 45 分
地點:香港大學莊月明文娛中心 101 室
講者:羅家豪(香港大學數學系博士研究生)
講題:《規則主宰遊戲》
簡介:
在日常生活中,我們經常會碰到各式各樣的「遊戲」:有朋友之間的消遣娛樂,有不同層次的體育競技,有各行各業的技藝比拼,有政治場上的選舉逐鹿。每個「遊戲」都有自己的一套遊戲規則,遊戲的結果是根據規則而得出的,因此遊戲規則可謂主宰著整個遊戲的結果。正因為遊戲規則如斯重要,我們都希望遊戲有一套公平和合理的規則。
在講座中,我們會探討一下不同的「遊戲規則」例子,包括音樂頒獎禮、足球比賽和議會選舉等。我們嘗試以數學方法把規則的「公平合理性」量化。最後我們會發現, 在某些情況下,「公平合理」的遊戲規則是不存在的。
Date: 23 December 2007 (Sunday)
Time: 2:30 pm - 3:45 pm
Venue: Room 101, Chong Yuet Ming Amenities Centre, The University of Hong Kong
Speaker: Law Ka Ho (PhD student, Department of Mathematics, The University of Hong Kong)
Title: "The Rule of the Game Rules"
Abstract:
In daily life, we come across different types of "games" -- entertainment among friends, sports tournaments at various levels, contests of various professions as well as elections in politics. Each "game" has its own set of rules, based on which the result is obtained. Hence the result of the game is "ruled by the rules". Given such importance, we always want to have a set of fair and reasonable rules for a game.
In this talk, we will look at various examples of "rules of the game", from musical prize presentations, soccer games to parliamentary elections. We try to quantify mathematically "how fair and reasonable" a set of rules is. Eventually, we shall see that under some situations, a set of rules which is "fair and reasonable" simply does not exist.
日期:2007 年 12 月 23 日(星期日)
時間:下午 2 時 30 分至 3 時 45 分
地點:香港大學莊月明文娛中心 101 室
講者:羅家豪(香港大學數學系博士研究生)
講題:《規則主宰遊戲》
簡介:
在日常生活中,我們經常會碰到各式各樣的「遊戲」:有朋友之間的消遣娛樂,有不同層次的體育競技,有各行各業的技藝比拼,有政治場上的選舉逐鹿。每個「遊戲」都有自己的一套遊戲規則,遊戲的結果是根據規則而得出的,因此遊戲規則可謂主宰著整個遊戲的結果。正因為遊戲規則如斯重要,我們都希望遊戲有一套公平和合理的規則。
在講座中,我們會探討一下不同的「遊戲規則」例子,包括音樂頒獎禮、足球比賽和議會選舉等。我們嘗試以數學方法把規則的「公平合理性」量化。最後我們會發現, 在某些情況下,「公平合理」的遊戲規則是不存在的。
Date: 23 December 2007 (Sunday)
Time: 2:30 pm - 3:45 pm
Venue: Room 101, Chong Yuet Ming Amenities Centre, The University of Hong Kong
Speaker: Law Ka Ho (PhD student, Department of Mathematics, The University of Hong Kong)
Title: "The Rule of the Game Rules"
Abstract:
In daily life, we come across different types of "games" -- entertainment among friends, sports tournaments at various levels, contests of various professions as well as elections in politics. Each "game" has its own set of rules, based on which the result is obtained. Hence the result of the game is "ruled by the rules". Given such importance, we always want to have a set of fair and reasonable rules for a game.
In this talk, we will look at various examples of "rules of the game", from musical prize presentations, soccer games to parliamentary elections. We try to quantify mathematically "how fair and reasonable" a set of rules is. Eventually, we shall see that under some situations, a set of rules which is "fair and reasonable" simply does not exist.
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