With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: England was first inhabited by modern humans during the Upper Palaeolithic period, about 40,000 years ago.
text_B: In numerical linear algebra , a convergent matrix is a matrix that converges to the zero matrix under matrix exponentiation .. numerical linear algebra. numerical linear algebra. zero matrix. zero matrix. matrix exponentiation. matrix exponentiation
not_related.