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Reference.org
Quasitransitive relation
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<p>The mathematical notion of quasitransitivity is a weakened version of <a href="/facts/Transitive_relation/9r90y50r">transitivity</a> that is used in <a href="/facts/Social_choice_theory/ztMqy1bM">social choice theory</a> and <a href="/facts/Microeconomics/mX6Ek69Y">microeconomics</a>. Informally, a relation is quasitransitive if it is <a href="/facts/Symmetric_relation/ekCWDIAH">symmetric</a> for some values and transitive elsewhere. The concept was introduced by Sen (1969) to study the consequences of <a href="/facts/Arrow%2527s_theorem/PD9oI3ky">Arrow's theorem</a>. </p>