On reflection of stationary sets in ${\cal P}_\kappa\lambda$

by Jech and Shelah. [JeSh:671]
Transactions American Math Soc, 2000
Let kappa be an inaccessible cardinal, and let E_0= {x in P_kappa kappa^+:cf(lambda_x)=cf(kappa_x)} and E_1= {x in P_kappa kappa^+: kappa_x is regular and lambda_x = kappa_x^+} . It is consistent that the set E_1 is stationary and that every stationary subset of E_0 reflects at almost every a in E_1 .

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