# David Toth

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bio website tothchat.com location age member for 2 years, 4 months seen Sep 18 at 11:42 profile views 140

2010 - 2014, Imperial College London, MEng Computing

2014 - 2017, University of Leeds, a PhD candidate in Computability Theory

# 60 Questions

 8 Can we expand numbers on the left to produce irrational numbers? 7 What is $\aleph_0$ powered to $\aleph_0$? 6 If $S_n$ is a symmetric group, what is the name for $n$? 5 Show a subspace formed by a Klein bottle is homotopy-equivalent to $S^1 \vee S^1 \vee S^2$ 4 $dcl(A)=\{x \in M : x$ definable from $A \}$, Show $dcl(dcl(A)=A$

# 827 Reputation

 +5 $dcl(A)=\{x \in M : x$ definable from $A \}$, Show $dcl(dcl(A)=A$ +5 Given a topological space $X$, does $H_1(X)=\mathbb{Z}$ imply $\pi(X)=\mathbb{Z}$? +5 Lee, Introduction to Smooth Manifolds Solutions +5 What is $1 / \mathbf{Set}$ if $1$ is a one-element set and $\mathbf{Set}$ a category?

 4 $dcl(A)=\{x \in M : x$ definable from $A \}$, Show $dcl(dcl(A)=A$ 1 $\pi_1(X)$ finite, show $f:X \to S^1$ is nullhomotopic 1 Question about null-homotopic function 0 Is the given Language decidable or recognizable? 0 Prove $\Lambda^kf:\Lambda^kW^* \to \Lambda^kV^*$ well-defined and linear

# 59 Tags

 1 algebraic-topology × 15 0 group-theory × 7 1 homotopy-theory × 2 0 notation × 5 0 definition × 9 0 linear-algebra × 4 0 model-theory × 8 0 category-theory × 4 0 manifolds × 7 0 differential-forms × 4

# 20 Accounts

 Mathematics 827 rep 310 Academia 482 rep 214 Computer Science 296 rep 17 English Language & Usage 237 rep 27 Super User 130 rep 6