
doi: 10.1007/bf02187348
It is shown that if the natural order on a total extension Open image in new window of an effect algebra Open image in new window coincides with the order on Open image in new window , then Open image in new window is unique. The structure of Open image in new window is called a QI-algebra. It is shown that a QI-algebra is less general than a QMV-algebra, but that a QI-algebra is equivalent to a quasi-linear QMV-algebra. Some examples are given and the properties of these structures are studied.
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