He has a habit of always boasting.

A skew-symmetric matrix has the characteristic that its transpose matrix is the inverse of the original matrix.

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.

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.

He shortened the story and conveyed only the main points.

The 16-cell is one of the convex regular polytopes in four dimensions.

The 600-cell is one of the regular polytopes in four dimensions.