A diagonal matrix is a matrix in which all elements outside the main diagonal are zero.

The diagonal elements of this matrix are all 1.

The police apprehended the criminal.

He is the leader of that team.

The signal from the cell phone relay-station in this area is weak.

I create a balance sheet every month to understand my financial situation.

This ancient proverb, 'know the other side and yourself, and you will not be in danger in a hundred battles', teaches us the importance of understanding ourselves and others.

He is an expert in ethology.

We will act according to the Mountain Standard Time.

He is an expert in primatology and is engaged in the study of gorilla behavior.