Let M

_{n×n}be the space of real n×n matrices, regarded as a metric space with the distance function\(\displaystyle d(A,B)=\sum_{i,j} |a_{ij}-b_{ij}|\)for A=(a

_{ij}) and B=(b_{ij}).

Prove that \(\{A\in M_{n\times n}: A^m=0 \text{ for some positive integer }m\}\) is a closed set.

The best solution was submitted by Gee Won Suh (서기원), 2009학번. Congratulations!

Here is his Solution of Problem 2010-10.

Alternative solutions were submitted by 정성구 (수리과학과 2007학번, +3), 김치헌 (수리과학과 2006학번, +3), 강동엽 (2009학번, +2).

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