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Final topology : ウィキペディア英語版
Final topology
In general topology and related areas of mathematics, the final topology (or strong topology or colimit topology or inductive topology) on a set X, with respect to a family of functions into X, is the finest topology on ''X'' which makes those functions continuous.
The dual notion is the initial topology.
== Definition ==

Given a set X and a family of topological spaces Y_i with functions
:f_i: Y_i \to X
the final topology \tau on X is the finest topology such that each
:f_i: Y_i \to (X,\tau)
is continuous.
Explicitly, the final topology may be described as follows: a subset ''U'' of ''X'' is open if and only if f_i^(U) is open in ''Y''''i'' for each ''i'' ∈ ''I''.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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