discrete mathematics - n-rooks n-colors problem - Mathematics Stack Exchange

The problem goes as follows: $n$ colors are used to color the squares in a $n\times m$ chess board so that each color is used exactly $m$ times. Can you always place $n$ rooks on the board, so that

20 Best Discrete Mathematics eBooks of All Time - BookAuthority

20 Best Discrete Mathematics eBooks of All Time - BookAuthority

Wikipedia:School and university projects/Discrete and numerical mathematics/Learning plan - Wikipedia

Mandala #211 - TrendyMandalas

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combinatorics - Smallest $r$ for which there is an $r$-coloring of the grid wherein no two colors are adjacent more than once. - Mathematics Stack Exchange

discrete mathematics - Hitori and graph connectivity - Mathematics Stack Exchange

chessboard - Discrete Mathematics Counting and Combinations/Variations on Chess Board - Mathematics Stack Exchange