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Define the setoid that glues a set into a pt #5395

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urkud opened this issue Jun 22, 2023 · 0 comments
Open

Define the setoid that glues a set into a pt #5395

urkud opened this issue Jun 22, 2023 · 0 comments

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@urkud
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urkud commented Jun 22, 2023

Add a setoid with relation given by (x ∈ s ∧ y ∈ s) ∨ x = y and
prove basic properties.

Motivation: quotients of this type are common in counterexamples in
topology.

See also Zulip chat
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