A and B be 3xx3 martrices. Then AB=0 imp...

A and B be `3xx3` martrices. Then `AB=0` implies

`A=0` and `B=0`

`|A|=0` and `|B|=0`

either `|A|=0` or `|B|=0`

`A=0` or `B=0`

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