general topology : Math Help

Einstein field equation derivation

general-relativity
Updated February 18, 2019 06:20 AM

existence of space and deformation retraction

algebraic-topology homotopy-type-theory
Updated February 18, 2019 04:20 AM

Let $X=\Bbb{N} \setminus \lbrace 1 \rbrace$, $A_n=\lbrace d\in X : d|n \rbrace$, for $n\in \Bbb{N}$. Is $\tau=\lbrace A_n : n\in \Bbb{N}$ topology?

general-topology
Updated February 18, 2019 03:20 AM

Show that $\mathbb{R^{n}}$ is not compact by definition

general-topology analysis manifolds compactness
Updated February 18, 2019 02:20 AM

Show that $\tau$ is strictly finer than the euclidean topology.

general-topology
Updated February 18, 2019 02:20 AM

existence and unicity of the index isomorphism

algebraic-topology homotopy-theory
Updated February 18, 2019 01:20 AM

How to show that $f(x)$ is not continuous using open sets?

real-analysis general-topology
Updated February 18, 2019 00:20 AM

Show that the topology on X is contained in the Box topology on X

general-topology set-theory
Updated February 18, 2019 00:20 AM

Showing that there is not a global diffeomorphism between unit quaternions and $\mathrm{SO}(3)$

manifolds differential-topology quaternions diffeomorphism
Updated February 18, 2019 00:20 AM

Is my proof that $\overline{A}\cup\overline{B} = \overline{A\cup B}$ correct?

general-topology proof-verification
Updated February 17, 2019 20:20 PM

Is this proof that $\text{diam}(A) = \text{diam}(\bar{A})$ correct?

general-topology metric-spaces
Updated February 17, 2019 20:20 PM

A map that has no lift

general-topology algebraic-topology
Updated February 17, 2019 19:20 PM

Is it true that every neighbourhood of zero is sum of some two other neighbourhoods of zero

real-analysis general-topology
Updated February 17, 2019 18:20 PM

homotopy equivalence between the cylinder of a map

algebraic-topology homotopy-theory
Updated February 17, 2019 17:20 PM

necessary condition for a $T_1$ space to be paracompact

general-topology
Updated February 17, 2019 17:20 PM

Bing's house, but with n rooms?

algebraic-topology
Updated February 17, 2019 15:20 PM

Prove the equivalent conditions for nowhere dense subset.

general-topology proof-verification metric-spaces nowhere-dense
Updated February 17, 2019 15:20 PM

Open Sets in the Wedge Sum and a Homeomorphism

algebraic-topology quotient-spaces
Updated February 17, 2019 14:20 PM

Fundametal group and continuous extension to $\Bbb R^n$

algebraic-topology fundamental-groups
Updated February 17, 2019 13:20 PM

Show that if a topological space is metrizable then it is so in an infinite number of ways

general-topology metric-spaces
Updated February 17, 2019 12:20 PM

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