Certain spectra preserving maps on Banach algebras and the stability of their perturbations

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Molnar investigated, what is so called "multiplicatively spectra preserving maps" between C^*-algebras, and characterized such maps. We generalized the result by Molnar to such maps between unital, semisimple commutative Banach algebras. In addition, we proved that quite similar results to the above hold for "peripherally multiplicative maps" and "spectra radii preserving maps". We also investigated some differential equations in Banach space-valued function spaces, and gave a sufficient condition in order that Hyers-Ulam or Ger type stability hold.