Inter-universal Teichmuller Theory I ------------------------------------ ・Corrected misprints ("a ...-prime-strip" ---> "an ...-prime-strip") in the discussion preceding Fig. I1.2 (2 instances)  Definition 6.11, (i) (1 instance) ・Corrected two misprints ("cf. the proof of" ---> "the proof of" and "3.1.1]" ---> "[3.1.1],") in the final portion of  Example 3.2, (vi) ・Corrected a misprint ("(c), d)" ---> "(c), (d)") in Example 4.3, (i) ・Added a supplementary explanation concerning the term "positive automorphism" in the discussion of Definition 6.11, (i) Inter-universal Teichmuller Theory II ------------------------------------- ・Slightly modified misleading phrasing in the second sentence of Remark 1.4.1, (i) Inter-universal Teichmuller Theory IV ------------------------------------- ・Added item (v) to Remark 2.2.1