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Apparently, this user prefers to keep an air of mystery about them.

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  • Member for 5 years, 5 months
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  • Last seen Jan 5 '19 at 22:01

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17 Why do we show that structures aren't isomorphic by exhibiting a property not shared by one of them? Jul 22 '15
11 Categorical semantics explained – what is an interpretation? Jun 19 '16
7 What is the role of the proof system in a Henkin-proof of Completeness? Oct 4 '15
6 Does a retraction really “retracts” something? Nov 2 '15
6 Why are maximal consistent sets essential to Henkin-proofs of Completeness? Sep 24 '15
6 Natural transformations in Awodey's Category Theory Exercise 7.11.8 Dec 30 '15
5 Are all computable functions continuous or vice-versa? Mar 15 '16
5 What is wrong with this proof that the identity map of $S^1$ is nullhomotopic? May 25 '16
4 What is the pushout of $\mathbf{1} \longleftarrow \mathbf{2} \longrightarrow \mathbf{1}$? Jul 1 '16
4 Why the fact that $\mathbb{N}$ has decidable equality does not imply $\mathsf{HA} = \mathsf{PA}$? Aug 8 '16
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