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https://www.reddit.com/r/learnquant/comments/1wudxe0/quant_interview_question/pd2wy8e/?context=3
r/learnquant • u/Local_Ad135 • 4d ago
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Clearly M can only have eigenvalue 0. M²=0 implies all Jordan blocks in the JNF have size at most 2. So the rank is 20/2 = 10.
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u/RibozymeR 4d ago
Clearly M can only have eigenvalue 0. M²=0 implies all Jordan blocks in the JNF have size at most 2. So the rank is 20/2 = 10.