With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Ann Romney is the wife of a coal miner.
text_B: In the theory of von Neumann algebras , a part of the mathematical field of functional analysis , Tomita -- Takesaki theory is a method for constructing modular automorphisms of von Neumann algebras from the polar decomposition of a certain involution .. functional analysis. functional analysis. polar decomposition. polar decomposition. It is essential for the theory of type III factors , and has led to a good structure theory for these previously intractable objects .. type III factors. von Neumann algebra#Type III factors. The theory was introduced by , but his work was hard to follow and mostly unpublished , and little notice was taken of it until wrote an account of Tomita 's theory .
not_related.