olymmath

Putnam 1990 A5

  • Session A

If A\mathbf{A} and B\mathbf{B} are square matrices of the same size such that ABAB=0\mathbf{ABAB = 0}, does it follow that BABA=0\mathbf{BABA = 0}?

Curated text Kedlaya Putnam archive. Quoted with source.

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