Current algebra theorems for the U(1) “Goldstone boson”

The U(1) problem is reconsidered from the point of view of the $\text{1}\text{N}$ expansion. It is argued that various heuristic ideas about the η′ are valid from this point of view. Current algebra theorems, similar to soft π theorems, are derived for the η′. They are valid to lowest order in $\text{1}\text{N}$.