Legg and Hutter, as well as subsequent authors, considered intelligent agents through the lens of interaction with reward-giving environments, attempting to assign numeric intelligence measures to such agents, with the guiding principle that a more intelligent agent should gain higher rewards from environments in some aggregate sense. In this paper, we consider a related question: rather than measure numeric intelligence of one Legg-Hutter agent, how can we compare the relative intelligence of two Legg-Hutter agents? We propose an elegant answer based on the following insight: we can view Legg-Hutter agents as candidates in an election, whose voters are environments, letting each environment vote (via its rewards) which agent (if either) is more intelligent. This leads to an abstract family of comparators simple enough that we can prove some structural theorems about them. It is an open question whether these structural theorems apply to more practical intelligence measures.
Oksana Ņikiforova, Sergii Putintsev and Dace Ahiļčenoka
, “Ambiguity and structuralproperties of basic sequence diagrams,” in Innovations Syst. Softw. Eng. vol. 4, pp. 275–284, 2008. http://dx.doi.org/10.1007/s11334-008-0063-2
 O. Nikiforova, D. Ahilcenoka, D. Ungurs, K. Gusarovs, L. Kozacenko, “Several Issues on the Layout of the UML Sequence and Class Diagram,” in Proc. of the 9th Int. Conf. on Software Engineering Advances , ICSEA 2014, France, Nice, 12–16 Oct., 2014. Wilmington: IARIA, 2014, pp. 40–47.
 Visual Paradigm, Drawing activity diagrams . [Online] Available: http