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つづき

参考６）（参考1の英文版）
https://en.wikipedia.org/wiki/Limit_(mathematics)
Limit (mathematics)

The concept of a limit of a sequence is further generalized to the concept of a limit of a topological net, and is closely related to limit and direct limit in category theory.

See also
・Limit in category theory
　・Direct limit
　・Inverse limit
(引用終り)
以上