Let $X_d$ be a $d$-manifold which is not a triangulable manifold but only a topological manifold.
Question:
- Is this true that $X_d \times T^k$:
The $X_d \times T^k$ can always be triangulable?
If not true, can $X_d \times T^k$ sometimes be triangulable? under what criteria? (for example, for a certain dimension $d$? for a certain bound on $k$? or when $X_d$ has a certain structure?)
Other info:
If $X_4$ is the non-triangulable Freedman's E8 topological manifold, then $X_{4+}=X_4\times T^$ is triangulable, but not PL.
Any orientable 5-manifold is triangulable.