What would it mean for a parameter region for a dynamic system to be E-stable, but indeterminate?
E-stable: it's stable under learning... so this means, once in equilibrium, you stay there? Or does it mean you always get there under learning?
undeterminate: super sensitive to parameter changes, tipping points may occur easily, there are multiple equilibria, etc etc?
The two seem to rather contradict, however, this combination is put forward in Figure 3 of Bullard and Mitra's (2002) paper for their adaptive learning New Keynesian model for monetary policy rules.
The other combination, Determinate and E-unstable or stable, either way, seems easier to grasp.
reference Bullard, J., & Mitra, K. (2002). Learning about monetary policy rules. Journal of Monetary Economics, 49(6), 1105–1129. https://doi.org/10.1016/S0304-3932(02)00144-7