/sci/ - Science & Math

>>10931445
When you read a lemma that a square matrix with a row of zeros or a column of zeroes does not have an Inverse, then it means it does not have a left inverse or a right inverse. Ok but can you mentally see this in split of a seconds and be satisfied? I can not. I will have to write down the formula and then look at it for at least 30 secs and then feel that yes it is true.