Scientists are developing a new type of fusion reactor.

In which direction is your house?

The result is certainly the result of his efforts.

My mother woke me up.

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.