(Comparing $\sigma$-algebras generated by some locally convex vector topologies on B(H

Let B(H) be the set of all bounded linear operators on a Hilbert space H. Here, we investigate the $\sigma$-algebras generated by seven locally convex vector topologies on B(H), where H is a nonseparable Hilbert space. Moreover, by presenting some examples we show the set of operator valued $\tau$-measurable functions is not closed under addition and product operations, where $\tau$ runs .over these seven topologies