Credits

Problem Sources   |   Photo Credits

 

Problem Sources

The challenge problems have been drawn from a variety of sources. These include:

• The American Mathematics Competitions, organized by the Mathematical Association of America.
  
• The National Association of Math Circles, a project of the Mathematical Sciences Research Institute. There are also a number of problem collections from the MSRI Mathematical Circles Library, available from the American Mathematical Society bookstore.
  
• The Math Teachers' Circle Network, a project of the American Institute Mathematics.
  
• The National Council of Teachers of Mathematics, which includes a problem calendar in their journal Mathematics Teacher.
• The Art and Craft of Problem Solving, by Paul Zeitz: a excellent book by a great lover and teacher of problem solving.

Problems from the above sources have sometimes been adapted for use on Collaborative Mathematics. Other problems are original, coming from my personal experiences and conversations with other problem solvers.

 

Photo Credits

The photos that have been used in the number montages are mostly images from flickr artists, used under either a Creative Commons Attribution license or a Creative Commons Attribution-ShareAlike license. Their use here is licensed under the same Creative Commons Attribution-ShareAlike license.

--- All number images 1-16 on the home page are by Leo Reynolds. https://www.flickr.com/photos/lwr/

--- Images on page "Information for Teachers and Parents".
1. Jon Jordan. http://www.flickr.com/photos/jontintinjordan/3736095515/
5. Marcin Wichary. http://www.flickr.com/photos/mwichary/2422726218/
12. Andreas Cappell. http://www.flickr.com/photos/cappellmeister/34202849/
22. Jon Jordan. http://www.flickr.com/photos/jontintinjordan/4056535163/
35. Tim Regan. http://www.flickr.com/photos/dumbledad/5591747641/
51. Marcin Wichary. http://www.flickr.com/photos/mwichary/3090844752/
70. Kristy Hall. http://www.flickr.com/photos/fragiletender/5718489903/
92. Marcin Wichary. http://www.flickr.com/photos/mwichary/2290130427/
117. Evan P. Cordes. http://www.flickr.com/photos/pheezy/310410885/

--- Images on page "Curriculum".
2. Marcin Wichary. http://www.flickr.com/photos/mwichary/2290139071/
3. Kristy Hall. http://www.flickr.com/photos/fragiletender/5333200724/
5. Trevor Blake. http://www.flickr.com/photos/trevorblake/20333626/
7. Joe Jordan. http://www.flickr.com/photos/jontintinjordan/3736097923/
11. Andreas Cappell. http://www.flickr.com/photos/cappellmeister/34202626/
13. Horia Varlan. http://www.flickr.com/photos/horiavarlan/4617630753/
17. Horia Varlan. http://www.flickr.com/photos/horiavarlan/4562049053/
19. Joe Jordan. http://www.flickr.com/photos/jontintinjordan/3736101261/
23. Kristy Hall. http://www.flickr.com/photos/fragiletender/5371740058/
29. Joe Jordan. http://www.flickr.com/photos/jontintinjordan/3736103649/
31. Kristy Hall. http://www.flickr.com/photos/fragiletender/5469675020/
37. Horia Varlan. http://www.flickr.com/photos/horiavarlan/4307768856/

--- Images on page "Challenge Archive".
1. Marcin Wichary. http://www.flickr.com/photos/mwichary/2290948874/
3. Marcin Wichary. http://www.flickr.com/photos/mwichary/2884222250/
6. Jon Jordan. http://www.flickr.com/photos/jontintinjordan/3736890944/
10. Andreas Cappell. http://www.flickr.com/photos/cappellmeister/34580856/
15. Joe Jordan. http://www.flickr.com/photos/jontintinjordan/3736893198/
21. Joe Jordan. http://www.flickr.com/photos/jontintinjordan/3736895102/
28. Stephan Mosel. http://www.flickr.com/photos/moe/46600687/
36. Kristy Hall. http://www.flickr.com/photos/fragiletender/6163857767/
45. Kristy Hall. http://www.flickr.com/photos/fragiletender/5385930976/
55. Kristy Hall. http://www.flickr.com/photos/fragiletender/5495677600/
66. Kristy Hall. http://www.flickr.com/photos/fragiletender/5670985778/

--- Images on page "About the Project".
1. Marcin Wichary. http://www.flickr.com/photos/mwichary/2679261089/
2. Will Temple. http://www.flickr.com/photos/grubbymits/5456399135/
4. Andreas Cappell. http://www.flickr.com/photos/cappellmeister/34200282/
8. Jon Jordan. http://www.flickr.com/photos/jontintinjordan/3736891660/
16. Andreas Cappell. http://www.flickr.com/photos/cappellmeister/34203934/
31. Jon Jordan. http://www.flickr.com/photos/jontintinjordan/3736897422/
57. Stephan Mosel. http://www.flickr.com/photos/moe/13964360/
99. Jon Jordan. http://www.flickr.com/photos/jontintinjordan/4732836900/
163. Marcin Wichary. http://www.flickr.com/photos/mwichary/2884558720/

--- Images on page "Contact Us".
1. Kristy Hall. http://www.flickr.com/photos/fragiletender/5332584247/
9. Andreas Cappell. http://www.flickr.com/photos/cappellmeister/34579775/
16. Joe Jordan. http://www.flickr.com/photos/jontintinjordan/3736100179/
25. Andreas Cappell. http://www.flickr.com/photos/cappellmeister/39509033/
36. Marcin Wichary. http://www.flickr.com/photos/mwichary/3126250557/
49. Andreas Cappell. http://www.flickr.com/photos/cappellmeister/34207440/
64. Marcin Wichary. http://www.flickr.com/photos/mwichary/2891842366/
81. See-ming Lee. http://www.flickr.com/photos/seeminglee/142117306/
100. Marcin Wichary. http://www.flickr.com/photos/mwichary/2150547167/
121. Marcin Wichary. http://www.flickr.com/photos/mwichary/2503322424/

--- Other images...
100. Andreas Cappell. http://www.flickr.com/photos/cappellmeister/34581361/
101. Marcin Wichary. http://www.flickr.com/photos/mwichary/2498052163/
102. Marcin Wichary. http://www.flickr.com/photos/mwichary/2498053663/
404. Leo Reynolds. http://www.flickr.com/photos/lwr/1162193666/
Flags (on translation page). Horia Varlan. http://www.flickr.com/photos/horiavarlan/4290551550/