In linear algebra, triangular matrices play a very important role.

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.

A lower triangular matrix is a matrix where all the elements below the main diagonal are zero.

Cold fusion is a part of physics and is a phenomenon that is not yet fully understood.

Research on cold fusion is still controversial.

There is a complex love triangle between them.

The result is certainly the result of his efforts.

My mother woke me up.

The number of nuclear-armed countries is increasing worldwide.