Lévy's modulus of continuity theorem: Difference between revisions

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'''Quasitransitivity''' is a weakened version of [[transitive relation|transitivity]] that is used in [[social choice theory]] or [[microeconomics]]. Informally, a relation is quasitransitive if it is symmetric for some values and transitive elsewhere.
 
==Formal definition==
A [[binary relation]] T over a [[Set (mathematics)|set]] ''X'' is '''quasitransitive''' if for all ''a'', ''b'', and ''c'' in ''X'' the following holds:
 
: <math>(a\operatorname{T}b) \wedge \neg(b\operatorname{T}a) \wedge (b\operatorname{T}c) \wedge \neg(c\operatorname{T}b) \Rightarrow (a\operatorname{T}c) \wedge \neg(c\operatorname{T}a).</math>
 
If the relation is also antisymmetric, T is transitive.
 
Alternately, for a relation T, define the [[symmetric relation|asymmetric]] part P:
:<math>(a\operatorname{P}b) \Leftrightarrow (a\operatorname{T}b) \wedge \neg(b\operatorname{T}a).</math>
 
Then T is quasitransitive iff P is transitive.
 
==Examples==
 
[[Preference]]s are assumed to be quasitransitive (rather than transitive) in some economic contexts. The classic example is a person indifferent between 10 and 11 grams of sugar and indifferent between 11 and 12 grams of sugar, but who prefers 12 grams of sugar to 10.
 
==See also==
* [[Intransitivity]]
* [[Reflexive relation]]
 
[[Category:Mathematical relations]]
[[Category:Social choice theory]]
 
{{math-stub}}

Latest revision as of 20:23, 6 May 2013

Quasitransitivity is a weakened version of transitivity that is used in social choice theory or microeconomics. Informally, a relation is quasitransitive if it is symmetric for some values and transitive elsewhere.

Formal definition

A binary relation T over a set X is quasitransitive if for all a, b, and c in X the following holds:

(aTb)¬(bTa)(bTc)¬(cTb)(aTc)¬(cTa).

If the relation is also antisymmetric, T is transitive.

Alternately, for a relation T, define the asymmetric part P:

(aPb)(aTb)¬(bTa).

Then T is quasitransitive iff P is transitive.

Examples

Preferences are assumed to be quasitransitive (rather than transitive) in some economic contexts. The classic example is a person indifferent between 10 and 11 grams of sugar and indifferent between 11 and 12 grams of sugar, but who prefers 12 grams of sugar to 10.

See also

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