algebraic-geometry affine-schemes zariski-topology share | cite | improve this question edited mins ago windsheaf asked mins ago windsheaf windsheaf silver badges bronze badges $\endgroup$ $egingroup$ the question in your title is misleading since there does not always exist such a basic open set!...
badges bronze badges vote answers views ways to cross out $n^ / $ squares on a $n imes n$ chessboard how many patterns $p_n$ are there to cross out $n^ / $ squares on a $n imes n$ chessboard, so that the number of crossed out squares in each row and each column are all even?...
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