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We show that, contrarily to the widespread belief, in quantum mechanicsrepeatable measurements are not necessarily described by orthogonalprojectors--the customary paradigm of "observable". Nonorthogonalrepeatability, however, occurs only for infinite dimensions. We also show thatwhen a non orthogonal repeatable measurement is performed, the measured systemretains some "memory" of the number of times that the measurement has beenperformed.Comment: 4 pages, 1 figure, revtex4, minor change

There Exist Nonorthogonal Quantum Measurements that are Perfectly Repeatable