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On Ćirić type mappings with a nonunique coincidence points. (English) Zbl 0832.54035

The author shows that two results of J. Achari [ibid. 22(45), 5-8 (1980; Zbl 0465.54035)] are false and gives corrected versions in Section 2. Coincidence point theorems of Ćirić type [Publ. Inst. Math., Nouv. Sér. 17(31), 52-58 (1974; Zbl 0309.54035)] are given for three selfmaps of a metric space using the weak commutativity concept due to the reviewer [ibid. 32(46), 149-153 (1982; Zbl 0523.54030)].
Reviewer: S.Sessa (Napoli)

MSC:

54H25 Fixed-point and coincidence theorems (topological aspects)
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