... cited Theorem A.4, and arguing as in the proofs of the citedTheorems 8.1 and 9.12, we get the desired result.2.5. Proof of Theorem 1.4Arguing as in the proof of Theorem 1.3 above, we have Theorem ... α and β is a critical value of I.Our main results are the following theorems, which generalize the Z2versionof Mountain Pass Theorem and Saddle Point Theorem in [9, p. 24, Theorem 4.6 and ... generalizations ofMountain Pass Theorem and Saddle Point Theorem. The main tool for prov-ing these theorems is Theorem 2.2, which is a generalized deformation theorem. Hence, Theorem 2.2 is most important...