Wiedemann–Franz law: Difference between revisions

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In [[category theory]], a branch of [[mathematics]], a '''connected category''' is a [[category (category theory)|category]] in which, for every two objects ''X'' and ''Y'' there is a [[finite sequence]] of objects
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:<math>X = X_0, X_1, \ldots, X_{n-1}, X_n = Y</math>
with morphisms
:<math>f_i : X_i \to X_{i+1}</math>
or
:<math>f_i : X_{i+1} \to X_i</math>
for each 0 &le; ''i'' &lt; ''n'' (both directions are allowed in the same sequence). Equivalently, a category ''J'' is connected if each [[functor]] from ''J'' to a [[discrete category]] is constant. In some cases it is convenient to not consider the empty category to be connected.


A stronger notion of connectivity would be to require at least one morphism ''f'' between any pair of objects ''X'' and ''Y''. Clearly, any category which this property is connected in the above sense.
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A [[small category]] is connected [[if and only if]] its underlying graph is [[connected graph|weakly connected]].
 
Each category ''J'' can be written as a disjoint union (or [[coproduct]]) of a connected categories, which are called the '''connected components''' of ''J''. Each connected component is a [[full subcategory]] of ''J''.
 
==References==
*{{cite book | first = Saunders | last = Mac Lane | authorlink = Saunders Mac Lane | year = 1998 | title = [[Categories for the Working Mathematician]] | series = Graduate Texts in Mathematics '''5''' | edition = (2nd ed.) | publisher = Springer-Verlag | isbn = 0-387-98403-8}}
 
[[Category:Category theory]]
 
 
 
{{categorytheory-stub}}

Revision as of 01:39, 12 February 2014

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