The null space of an \((m,n)\)-matrix \(\Mtrx{A}\) is the collection of all those \(\Vect{x}\) in \(\RNrSpc{n}\) with \(\Mtrx{A}\cdot \Vect{x} = \Vect{0}\). We denote it by \(\NullSpc{ \Mtrx{A} }\)