With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Sweden was neutral in both world wars.
text_B: Ralph Tyrrell Rockafellar -LRB- born February 10 , 1935 -RRB- is one of the world 's leaders in optimization theory and related fields of analysis and combinatorics .. optimization theory. mathematical optimization. analysis. mathematical analysis. combinatorics. oriented matroid. He is professor emeritus at the departments of mathematics and applied mathematics at the University of Washington , Seattle .. Washington. Washington ( state ). University of Washington. University of Washington. mathematics. mathematics. applied mathematics. applied mathematics. He was born in Milwaukee , Wisconsin .
not_related.