### 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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