holomorphic $$\delta K=\delta f(t)+cc.$$ Such a correction can, however, be absorbed into the superpotential which is a holomorphic section of a line bundle $W\rightarrow
exp(-\delta f(t))W$, so that the solution is unaffected.

The non-perturbative non-renormalization theorem of the type IIB superpotential is valid for models containing no Kähler moduli. The mirror type IIA interpretation of this result is that for models with only one three-cycle there are no non-perturbative corrections, as the only available three-cycle contains $H_{NS}$ flux. We will return to possible non-perturbative corrections in Section 5.

IIB Flux Vacua at Weak Coupling
===============================

In this section we derive the equations constraining the three bulk moduli. We shall see that mirror symmetry and the duality to the IIA model of [@wati] predicts a subtle correction to the dilaton Kähler potential in type IIB, which cannot be obtained by a Kaluza-Klein reduction, in accord with the fact that our model is not geometric in the first place. We will see that this correction opens new directions in the landscape leading to an infinite set of new AdS type vacua in the large complex structure limit! Minkowski vacua with stabilized moduli are unaffected and constrained to live at strong coupling [@BVW].

