Mathematical Olympiad Problem
73519
Determine all functions satisfying $f(x + f(x + y)) + f(xy) = x + f(x + y) +yf(x)$
108425
Problem on abelian group
139039
Stars and Bars Combinatorics Problem
136290
a mathematical problem on inequalities
26898
Trouble solving two number theoretical problems
121063
Mathematics of Tetris 2.0
150281
Am I on the right track to figure out this combinatorics problem?
10839
Problem in Cardinality and Order
34493
Concrete Mathematics - The Josephus Problem
377
Problem involving many squares and several variables.
67249
Can you determine a formula for this problem?
71918
Mathematical Induction
104603
Integer program in which at least one of three inequalities holds
80155
Binomial coefficient problem
78163
Hint for problem on $4 \times 7$-chessboard problem related to pigeonhole principle
14783
A Number Theory problem (GCD)
110297
Problem related to quadratic equations