SZTE Repository of Papers and Books: No conditions. Results ordered -Date Deposited. 2020-09-20T08:11:21ZEPrintshttp://acta.bibl.u-szeged.hu/images/acta.jpghttp://acta.bibl.u-szeged.hu/2019-01-30T05:29:57Z2019-09-09T13:44:04Zhttp://acta.bibl.u-szeged.hu/id/eprint/56923This item is in the repository with the URL: http://acta.bibl.u-szeged.hu/id/eprint/569232019-01-30T05:29:57ZOn order automorphisms of the effect algebraWe give short proofs of two descriptions given by Šemrl of order automorphisms of the effect algebra. This sheds new light on both formulas that look quite complicated. Our proofs rely on Molnár’s characterization of order automorphisms of the cone of all positive operators.Roman Drnovšek