In the past, I have ever been an active member in this site and definitely mathdb has ever been the best Math website in my mind. One day I realized that the maintainence of such a good website was overlooked somehow and therefore I left this site and migrated to www.artofproblemsolving!
In terms of quality and quantity, mathdb is still a well structured website in the wolrd, but it will be a waste if no one cares about the future of such a potentially brilliant website…… sigh~

COSISTENTCY IS IMPORTANT!