Equivalence of deformations of Berglund Hübsch mirror pairs

We investigate here the deformations of Berglund Hübsch loop and chain mirrors where the original manifolds are defined in the same weighted projective space. We show that the deformations are equivalent by two methods. First, we map directly the two models to each other and show that the deformations are the same for 79 “Good” models, but not for the 77 “Bad” ones. We then investigate the orbifold of the mirror pair by the maximal symmetry group and show that the number of deformations is the same and that they are almost the same, i.e., the first four exponents of the deformations are identical.