Difference between revisions of "Comments:GGB ATCM Thailand 2012"

From GeoGebra Manual
Jump to: navigation, search
 
(97 intermediate revisions by the same user not shown)
Line 1: Line 1:
Pre- ATCM GeoGebra Conference 2012
+
GeoGebra Pre-ATCM Conference 2012
http://atcm.mathandtech.org/
 
The 17th Asian Technology Conference in Mathematics
 
(ATCM 2012), December 16-20, 2012, Suan Sunandha Rajabhat University, Bangkok, Thailand
 
 
 
 
 
'''GeoGebra ICME Pre-conference, Seoul, Korea'''
 
 
 
==우리말 사용자를 위하여==
 
* 학회 등록은 [https://docs.google.com/spreadsheet/viewform?pli=1&formkey=dDdHUUdZNW45b296UU00SmVpcWhTeUE6MQ 지오지브라 학회 등록페이지]에서 할 수 있습니다.
 
* [http://cafe.naver.com/geogebra/3411 학회 등록 참고자료]를 방문하여, 첨부된 PDF 파일을 참고하거나, [mailto:kyeong@geogebra.or.kr kyeong@geogebra.or.kr]로 문의 주시기 바랍니다.
 
 
 
==등록방법==
 
*학회등록 : [https://docs.google.com/a/geogebra.at/spreadsheet/viewform?pli=1&formkey=dDdHUUdZNW45b296UU00SmVpcWhTeUE6MQ#gid=0 등록페이지]
 
 
 
*학회비 : 40,000 원(현장에서 납부)
 
 
 
==연락처==
 
*[mailto:shinis@knue.ac.kr,'''신인선'''] 학회조직위원장, 한국교원대학교, 한국교원대학교 지오지브라 연구소장
 
*[mailto:kyeong@geogebra.org'''최경식'''] 학회운영총책임(Tel. 010-8365-7776), 전국수학교사모임 부설 지오지브라 연구소장
 
*[mailto:hsdoggabi@gmail.com'''전수경'''] 학회운영부책임, 경북지역 지오지브라 팀장
 
*[mailto:hsdoggabi@gmail.com'''김은하'''] 학회운영부책임, 경북지역 지오지브라 팀
 
*[mailto:math1347@naver.com'''이선영'''] 학회운영스탭, 전국수학교사모임 부설 지오지브라 연구소
 
*[mailto:sang1128@hanmail.net'''조운상'''] 학회운영스탭, 전국수학교사모임 부설 지오지브라 연구소
 
*[mailto:lmathlove@hanmail.net'''이명기'''] 학회운영스탭, 전국수학교사모임 부설 지오지브라 연구소
 
*[mailto:rohsena@msn.com'''노경희'''] 학회운영스탭, 전국수학교사모임 부설 지오지브라 연구소
 
*[mailto:gauss9@nate.com'''김동석'''] 학회운영스탭, 전국수학교사모임 부설 지오지브라 연구소
 
*[mailto:kimsj0726@paran.com'''김상진'''] 학회운영스탭, 전국수학교사모임 부설 지오지브라 연구소
 
*[mailto:hohomam@gmail.com'''강순영'''] 학회운영스탭, 전국수학교사모임 부설 지오지브라 연구소
 
*[mailto:onlyhappyday@hanmail.net'''박민아'''] 학회운영스탭, 전국수학교사모임 부설 지오지브라 연구소
 
*[mailto:mathblue@chol.com'''김미령'''] 학회운영스탭, 전국수학교사모임 부설 지오지브라 연구소
 
 
 
 
==Introduction==
 
==Introduction==
ICME offers a good opportunity for the GeoGebra Community to meet colleagues from all around the world. Also, we can involve many colleagues and teachers from Korea and other Asian countries.
+
Our Pre-ATCM Conference offers a good opportunity for the GeoGebra Community to meet colleagues from all around the world. Also, we can involve many colleagues and teachers from Thailand and other Asian countries.
 
 
 
==Dates & Location==
 
==Dates & Location==
*Dates: July 8th, 2012
+
*Dates: Dec 16, 2012, 1 day before [http://atcm.mathandtech.org/ ATCM 2012 The 17th Asian Technology Conference in Mathematics]
*Location:  Seoul, Korea, [http://www.coex.co.kr/eng/index.asp COEX, Convention & Exhibition Center], room 317
+
*Location:  Institute for the Promotion of Teaching Science and Technology, Bangkok, Thailand; phone: +66 8564 90712 and [https://docs.google.com/open?id=0B_Hm5y1glb_lU2ZwMlFHVFVXcHM map]
*Accommodation: If ICME participant go to ICME website and reserve accommodation.
+
*Accommodation: If ATCM participant go to [http://atcm.mathandtech.org/ ATCM website] and reserve accommodation.
 
 
 
==Structure  and Agenda==
 
==Structure  and Agenda==
'''Sunday, 8th of July, 2012'''
 
 
 
{| style="color:black" cellpadding="10" cellspacing="0" border="1"
 
{| style="color:black" cellpadding="10" cellspacing="0" border="1"
 
|9:00-9:30
 
|9:00-9:30
Line 50: Line 15:
 
|-
 
|-
 
|9:40-10:10
 
|9:40-10:10
|Keynote: Hee-Chan Lew
+
|Keynote Zaleha Ismail: [https://docs.google.com/a/geogebra.at/file/d/0B_Hm5y1glb_lUXVQeTJEamVJOFU/edit Statistical Reasoning with GeoGebra]
 
|-
 
|-
 
|10:10-10:40
 
|10:10-10:40
|Keynotes: Zsolt Lavicza and Balazs Koren
+
|Keynote Lavicza Zsolt: [http://prezi.com/e99lzants09b/geogebra-thailand-2012/ GeoGebra Community and STEM Education]
 
|-
 
|-
 
|10:40-11:00
 
|10:40-11:00
Line 65: Line 30:
 
|-
 
|-
 
|13:30-14:00
 
|13:30-14:00
|Keynote: Cao Yiming
+
|Keynote Anthony  C. M. Or: [https://docs.google.com/a/geogebra.at/file/d/0B_Hm5y1glb_ldzJ3T1NNZnFfQ00/edit Catering for Learning Needs in Mathematics]
|-
 
|14:00-14:30
 
|Keynote: Gabriel Stylianides
 
 
|-
 
|-
|14:30-16:00
+
|14:00-15:30
 
|Presentations II
 
|Presentations II
 
|-
 
|-
|16:00-16:20
+
|15:30-15:50
 
|Coffee Break
 
|Coffee Break
 
|-
 
|-
|16:20-17:20
+
|15:50-17:20
 
|Discussions
 
|Discussions
 
|-
 
|-
Line 82: Line 44:
 
|Closure
 
|Closure
 
|-
 
|-
|18:30-
 
|Dinner(ICME)
 
|-
 
|}
 
 
 
== Sessions ==
 
== Sessions ==
There will be four keynote presentations highlighting important issues in both software and community developments (20min+10min questions). We welcome submissions for short presentations about interesting applications of GeoGebra, research and local community activities, these presentations can be 10min + 2min due to the shortage of time. Posters can be also presented.
+
There will be 3 keynote presentations highlighting important issues in both software and community developments (20min+10min questions). We welcome submissions for short presentations about interesting applications of GeoGebra, research and local community activities, these presentations can be 15min + 5min. Posters can be also presented.
 
 
 
'''Schedule''':
 
'''Schedule''':
 
{| style="color:black" cellpadding="8" cellspacing="0" border="1"
 
{| style="color:black" cellpadding="8" cellspacing="0" border="1"
Line 95: Line 51:
 
|'''11:00-12:30'''
 
|'''11:00-12:30'''
 
|-
 
|-
|Tabach Michal
+
|Rachaya Srisurichan
|[https://docs.google.com/a/geogebra.at/file/d/0B_Hm5y1glb_lNzJ0b2tWNV9YMk0/edit Learning with technology: Prospective Mathematics Teachers and Triangles Attitudes]
+
|Activity of Institute for the Promotion of Teaching Science and Technology
|-
 
|Kyeong Choi
 
|[https://docs.google.com/open?id=0B_Hm5y1glb_lMFZ5U2pOanMzSDA History of GeoGebra in Korea]
 
 
|-
 
|-
|Gerry Stahl and Arthur Powell
+
|Talgat Bainazarov, Bolat Ospanov, Saulebek Mahashev
|[http://GerryStahl.net/pub/ggbkorea.pdf Multi-User GeoGebra for Virtual Math Teams], [http://www.youtube.com/watch?v=8bkGHhgyQZY video]
+
|Visualization of maximum and minimum areas of inscribed figures
 
|-
 
|-
|Anthony Chi-Ming Or
+
|Siti Nurashiken Binti Md Sabudin and Mazlena Binti Murshed
|[https://docs.google.com/a/geogebra.at/file/d/0B_Hm5y1glb_lc3IzSkd5NkhLQ0k/edit Designing GeoGebra Tasks to Foster Visualization and Reasoning]
+
|[https://docs.google.com/a/geogebra.at/file/d/0B_Hm5y1glb_lQUpWeXRSRXlKbDA/edit Activity of GeoGebra Institute of Johor Bahru, Malaysia]
 
|-
 
|-
|Hea-Jin Lee and Irina Boyadzhiev
+
|Steen Grode
|[https://docs.google.com/a/geogebra.at/file/d/0B_Hm5y1glb_lOUpZeDloUWNRZkE/edit Accessing Mathematics Concepts Through GeoGebra]
+
|[https://docs.google.com/a/geogebra.at/file/d/0B_Hm5y1glb_ldE5jT25ZdHUxeFE/edit A different mathematics teaching]
 
|-
 
|-
|Kaye Stacey
+
|
|[https://docs.google.com/a/geogebra.at/file/d/0B_Hm5y1glb_lTERKRjdmT0ozaUk/edit Using GeoGebra to bring the real world into the classroom]
+
|
 
 
 
|-
 
|-
 
|'''Presentations II'''
 
|'''Presentations II'''
|'''14:30-16:00'''
+
|'''14:00-15:30'''
 
|-
 
|-
|Carlos Fernandez-Gonzalez, Miguel Delgado, Blanca Souto and Antonio Costa
+
|Maha Ahmed Ismail
|[https://docs.google.com/a/geogebra.at/file/d/0B_Hm5y1glb_lWDhkY0wwR21sSHc/edit GeoGebra Projects at Spanish National Distance University], [https://docs.google.com/a/geogebra.at/file/d/0B_Hm5y1glb_lVzhRYm9SLVQ3OGc/edit more]
+
|GeoGebra in Egypt
 
|-
 
|-
|Naotoshi Hirono and Tadashi Takahashi
+
|Jamal Hussain
|[https://docs.google.com/a/geogebra.at/file/d/0B_Hm5y1glb_lbzdyRUFHdXZpVUk/edit The Dynamic Integration between Cas and DGS]
+
|[https://docs.google.com/a/geogebra.at/file/d/0B_Hm5y1glb_lQUpWeXRSRXlKbDA/edit Activity of GeoGebra Institute of Mizoram, India]
 
|-
 
|-
|Jorge Cassio Costa Nóbriga, Gilberto Lacerda Santos, Bruno Santos Ferreira and Renan de Lima
+
|Shabnam Alavi Saadat
|GGBook: One Interface which Integrates the Text and Graphic Enviroment in the GeoGebra
+
|[https://docs.google.com/a/geogebra.at/file/d/0B_Hm5y1glb_lTUNpRklmNklXSUU/edit Activity of GeoGebra Institute of Tehran, Iran]
 
|-
 
|-
|Mette Andresen
+
|Talgat Bainazarov, Bolat Ospanov, Saulebek Mahashev
|[https://docs.google.com/open?id=0B_Hm5y1glb_lWjBtTkhDejA1cms The ViT Project: Visualisation of Transformations]
+
|Activity of GeoGebra Institute of Astana, Kazakhstan
 
|-
 
|-
|María del Carmen Bonilla
+
|
|Explore, visualize and discover functions with dynamic geometry
+
|
 
|-
 
|-
|Mehmet Bulut, Neslihan Bulut and Muharrem Aktümen
 
|GeoGebra usage of preservice mathematics teachers during their school practice
 
|-
 
|Humberto Bortolossi
 
|[https://docs.google.com/a/geogebra.at/file/d/0B_Hm5y1glb_lYWVfYkQtS2xGYVk/edit Creating interactive digital educational contents in mathematics and statistics with the integrated use of technologies: GeoGebra, JavaView, HTML, CSS, MathML and JavaScript]
 
|-
 
 
 
|}
 
|}
 
 
== Registration ==
 
== Registration ==
*40,000 KRW (approx. 35 USD) which will cover room rent, coffee and lunch. Registration fee can be paid in KRW on the conference day.
+
*35 USD (=1050 THB) which will cover room rent, coffee and lunch. Registration fee can be paid in USD or THB on the conference day.
* [https://docs.google.com/a/geogebra.at/spreadsheet/viewform?pli=1&formkey=dDdHUUdZNW45b296UU00SmVpcWhTeUE6MQ#gid=0 Registration form] '''Important note:''' If you are not able to reach the form from your country, please send your registration request via email to events@geogebra.org!
+
* [https://docs.google.com/a/geogebra.at/spreadsheet/viewform?formkey=dDZpcVVJTmlNbncyT3U2UDhqbXU4YkE6MA#gid=0 Registration form]   '''Important note:''' If you are not able to reach the form from your country, please send your registration request via email to events@geogebra.org!
 
 
 
== Deadlines ==
 
== Deadlines ==
*1 July, 2012: Submission of presentation or poster abstracts (max 200 words)
+
*'''Nov 30, 2012:''' Submission of presentation or poster abstracts (max 200 words)
*1 July, 2012: Registration
+
*'''Nov 30, 2012:''' Registration
 
 
 
==Keynotes==
 
==Keynotes==
*'''Hee-Chan Lew''', Korea National University of Education ([https://docs.google.com/a/geogebra.at/file/d/0B_Hm5y1glb_lYTc4a0RFblo4SnM/edit GeoGebra = Geometry + Algebra])
+
*'''Zsolt Lavicza''', University of Cambridge, UK: GeoGebra Community and STEM Education
*'''Gabriel Stylianides''', University of Oxford ([https://docs.google.com/a/geogebra.at/file/d/0B_Hm5y1glb_lN3h1Tk1OVi0xRHM/edit Reasoning and Proof with GeoGebra])
+
[http://www.geogebra.org GeoGebra], a free, open-source, dynamic mathematics software, is rapidly gaining popularity in the teaching and learning of mathematics around the world. Currently, GeoGebra is translated to 62 languages, used in 190 countries, and downloaded by approximately 500,000 users in each month, and clearly making an impact on mathematics education in most countries. This increased use compelled the establishment of the International GeoGebra Institute (IGI) that serves as a virtual organization to support local GeoGebra initiatives and institutes. There are already 130 institutes in 85 countries, which pursue training and support of teachers, develop teaching materials, and carry out research projects. In this talk, I will outline the directions of GeoGebra software development, its extension to STEM subjects, activities of its community, and the work of GeoGebra Institutes.
In this presentation I will discuss GeoGebra’s potential role in supporting engagement with reasoning-and-proving, a hyphenated term that describes a family of activities related to investigations of whether and why “things work” in mathematics – notably generalizing (identifying patterns, making conjectures) and justifying (developing arguments and proofs).  I will also discuss recent developments in GeoGebra that can further support justification of mathematical generalizations.  The findings of prior research on the teaching and learning of reasoning-and-proving will serve as a backdrop for my discussion.
+
*'''Zaleha Ismail''', Technology University Malaysia, Chair of  [http://wiki.geogebra.org/en/GeoGebra_Institute_of_Johor_Bahru_Malaysia GeoGebra Institute of Johor Bahru]: Statistical Reasoning with GeoGebra
*'''Zsolt Lavicza''', University of Cambridge ([http://blog.geogebra.org/2012/07/geogebra-icme-pre-conference-slides/ GeoGebra Community and STEM Education])
+
Statistics is the most practical branch of mathematics since it is widely used in various sectors. Our research and others show evidences that many students held different misconceptions in statistics indicating they are weak in statistical reasoning (SR). Neglecting this problem will definitely impede students’ learning of statistics and curtail their enthusiasm if the problem is not overcome. A technology-based SR activity and a technology-based SR assessment tool were developed to promote SR ability and address learners' misconceptions. These instruments are based on SR framework proposed by Garfield (2002) and Jones et.al. (2000). The descriptors of SR framework are established across four key constructs with each construct divided into three subprocesses. The four major constructs are describing datas, organizing and reducing datas, representing datas, analyzing and interpreting data. The dynamic spreadsheet of GeoGebra software  is used in technology-based SR activity as well as in technology-based SR assessment tool. Both tools were validated and rated by experts in statistics and  then were tested on students through empirical research. We will discuss the design and development stage as well as to share our GeoGebra activities. This product not only introduce new way of looking at statistics but it will transform the way we learn, teach and assess statistics.
[http://geogebra.org GeoGebra], a free, open-source, dynamic mathematics software, is rapidly gaining popularity in the teaching and learning of mathematics around the world. Currently, GeoGebra is translated to 58 languages, used in 190 countries, and downloaded by approximately 400,000 users in each month, and clearly making an impact on mathematics education in most countries. This increased use compelled the establishment of the International GeoGebra Institute (IGI) that serves as a virtual organization to support local GeoGebra initiatives and institutes. There are already 99 institutes in 75 countries, which pursue training and support of teachers, develop teaching materials, and carry out research projects. In this talk, I will outline the directions of GeoGebra software development, its extension to STEM subjects, activities of its community, and the work of GeoGebra Institutes.  
+
*'''Anthony C.M. Or''', Education Bureau , Hong Kong, Chair of [http://wiki.geogebra.org/en/GeoGebra_Institute_of_Hong_Kong GeoGebra Institute of Hong Kong]: GeoGebra in Hong Kong: Catering for Learning Needs in Mathematics
*'''Balazs Koren''', International GeoGebra Institute ([http://blog.geogebra.org/2012/07/geogebra-icme-pre-conference-slides/ GeoGebra 4, 4.2, 5, and Beyond])
+
This presentation introduces the recent work of GeoGebra Institute of Hong Kong on teacher training, resources development and collaborative studies. I will present how we develop GeoGebra tasks to cater for the learning needs identified in our system assessments and collaborative studies through the fostering of visualization and reasoning in GeoGebra. The presentation will be illustrated by some resources in our depository on the topics quadrilaterals, multiplication and division of fractions, and the concept of slope.
GeoGebra 4.0 was released in September 2011. With this version many new functionalities were introduced. Statistics view, one click upload to GeoGebra, just to mention some of the features. GeoGebra is not even 1 year old, but already contains more than 10 000 materials.
 
4.2 is the new beta, which is going to be released as stable in autumn 2012. The most awaited new feature in 4.2 is the CAS.
 
The development of 5.0 has already started, in this new version of GeoGebra the real 3D view is introduced.  
 
Do you own a tablet or smartphone? Do you want to use GeoGebra on your new gadget? The development for these devices already started.  
 
 
 
*'''Cao Yiming''', Beijing Normal University ([https://docs.google.com/a/geogebra.at/file/d/0B_Hm5y1glb_la0lyZVBrOHcxWjQ/edit GeoGebra in China])
 
This report introduces current development in three aspects including network construction, theoretical work and teaching practice. GeoGebra Institute of Beijing Normal University offers software download and curriculum resources through GGB in China Weibo, the similar service as Twitter, and GeoGebra Blog for the convenience of users in China. GeoGebra Institute of Beijing Normal University also translates and edits Users’ Guide of GeoGebra to expand influence in Chinese Middle School teachers. Series of papers introducing GeoGebra were published in The largest circulation magazine of Chinese basic mathematic education. GeoGebra Institute of Beijing Normal University and of Tianjin offers lectures for normal college students and working teachers, covering secondary school teachers in Beijing, rural areas and Xinjiang(Uygur Autonomous Region).
 
 
 
 
== Contacts ==
 
== Contacts ==
 
* [mailto:events@geogebra.org '''GeoGebra Events ''' ]
 
* [mailto:events@geogebra.org '''GeoGebra Events ''' ]
 +
== Next GeoGebra pre-conference in Asia==
 +
[http://wiki.geogebra.org/en/GGB_Earcome_Thailand_2013 Pre- Earcome GeoGebra Conference 2013] on Mar 17, 2013 in Phuket, Thailand
 +

Latest revision as of 01:17, 15 January 2013

GeoGebra Pre-ATCM Conference 2012

Introduction

Our Pre-ATCM Conference offers a good opportunity for the GeoGebra Community to meet colleagues from all around the world. Also, we can involve many colleagues and teachers from Thailand and other Asian countries.

Dates & Location

Structure and Agenda

Sessions

There will be 3 keynote presentations highlighting important issues in both software and community developments (20min+10min questions). We welcome submissions for short presentations about interesting applications of GeoGebra, research and local community activities, these presentations can be 15min + 5min. Posters can be also presented. Schedule:

9:00-9:30 Registration
9:30-9:40 Opening
9:40-10:10 Keynote Zaleha Ismail: Statistical Reasoning with GeoGebra
10:10-10:40 Keynote Lavicza Zsolt: GeoGebra Community and STEM Education
10:40-11:00 Coffee Break
11:00-12:30 Presentations I
12:30-13:30 Lunch break
13:30-14:00 Keynote Anthony C. M. Or: Catering for Learning Needs in Mathematics
14:00-15:30 Presentations II
15:30-15:50 Coffee Break
15:50-17:20 Discussions
17:20-17:30 Closure
Presentations I 11:00-12:30
Rachaya Srisurichan Activity of Institute for the Promotion of Teaching Science and Technology
Talgat Bainazarov, Bolat Ospanov, Saulebek Mahashev Visualization of maximum and minimum areas of inscribed figures
Siti Nurashiken Binti Md Sabudin and Mazlena Binti Murshed Activity of GeoGebra Institute of Johor Bahru, Malaysia
Steen Grode A different mathematics teaching
Presentations II 14:00-15:30
Maha Ahmed Ismail GeoGebra in Egypt
Jamal Hussain Activity of GeoGebra Institute of Mizoram, India
Shabnam Alavi Saadat Activity of GeoGebra Institute of Tehran, Iran
Talgat Bainazarov, Bolat Ospanov, Saulebek Mahashev Activity of GeoGebra Institute of Astana, Kazakhstan

Registration

  • 35 USD (=1050 THB) which will cover room rent, coffee and lunch. Registration fee can be paid in USD or THB on the conference day.
  • Registration form Important note: If you are not able to reach the form from your country, please send your registration request via email to events@geogebra.org!

Deadlines

  • Nov 30, 2012: Submission of presentation or poster abstracts (max 200 words)
  • Nov 30, 2012: Registration

Keynotes

  • Zsolt Lavicza, University of Cambridge, UK: GeoGebra Community and STEM Education

GeoGebra, a free, open-source, dynamic mathematics software, is rapidly gaining popularity in the teaching and learning of mathematics around the world. Currently, GeoGebra is translated to 62 languages, used in 190 countries, and downloaded by approximately 500,000 users in each month, and clearly making an impact on mathematics education in most countries. This increased use compelled the establishment of the International GeoGebra Institute (IGI) that serves as a virtual organization to support local GeoGebra initiatives and institutes. There are already 130 institutes in 85 countries, which pursue training and support of teachers, develop teaching materials, and carry out research projects. In this talk, I will outline the directions of GeoGebra software development, its extension to STEM subjects, activities of its community, and the work of GeoGebra Institutes.

Statistics is the most practical branch of mathematics since it is widely used in various sectors. Our research and others show evidences that many students held different misconceptions in statistics indicating they are weak in statistical reasoning (SR). Neglecting this problem will definitely impede students’ learning of statistics and curtail their enthusiasm if the problem is not overcome. A technology-based SR activity and a technology-based SR assessment tool were developed to promote SR ability and address learners' misconceptions. These instruments are based on SR framework proposed by Garfield (2002) and Jones et.al. (2000). The descriptors of SR framework are established across four key constructs with each construct divided into three subprocesses. The four major constructs are describing datas, organizing and reducing datas, representing datas, analyzing and interpreting data. The dynamic spreadsheet of GeoGebra software is used in technology-based SR activity as well as in technology-based SR assessment tool. Both tools were validated and rated by experts in statistics and then were tested on students through empirical research. We will discuss the design and development stage as well as to share our GeoGebra activities. This product not only introduce new way of looking at statistics but it will transform the way we learn, teach and assess statistics.

This presentation introduces the recent work of GeoGebra Institute of Hong Kong on teacher training, resources development and collaborative studies. I will present how we develop GeoGebra tasks to cater for the learning needs identified in our system assessments and collaborative studies through the fostering of visualization and reasoning in GeoGebra. The presentation will be illustrated by some resources in our depository on the topics quadrilaterals, multiplication and division of fractions, and the concept of slope.

Contacts

Next GeoGebra pre-conference in Asia

Pre- Earcome GeoGebra Conference 2013 on Mar 17, 2013 in Phuket, Thailand

© 2024 International GeoGebra Institute