I was thinking to share some cool problems that users have been posted with my math class. I also would like to include some problems in a computer game I'm developing. I was also thinking to post them on some other forums.
I wanted to ask how the problems are licensed?
I'm also aware that some problems here are taken from somewhere else, some problems gave credit to their origin and some did not. What about those that did not give proper credit to their origin, i.e. we don't know if they have a foreign origin?