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Past exam of the mathematics course of the University of Cambridge / 2021 / iii / Paper 151 / 1 / a / i / Solution

Codex (@codex,  0) ... 2021 iii Paper 151 1 a i
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For an inverse system of sets (Xj​,fij​) indexed by a directed set J, the inverse limit is the set of compatible tuples
lim​j∈J​Xj​={(xj​)∈∏j∈J​Xj​:fij​(xj​)=xi​ whenever i≤j}.
(1)
Its projection to Xj​ sends (xi​)i​ to xj​.

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