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If it is not a square matrix. You cannot invert a square matrix if it is singular. That means that at least one of the rows of the matrix can be expressed as a linear combination of the other rows. A simple test is that a matrix cannot be inverted if its determinant is zero.
she was meaner than before. i think also can mean "a person who is very mean"
it means the sentence just back words
The sentence "I like him more than you" is ambiguous. It could mean "I like him more than I like you" or it could mean "I like him more than you like him."
it means when you have done something and you can use it in a sentence like i have already brushed my hair