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15
266
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Doubts on obstruction theory (Hatcher's book)

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#general-topology #algebraic-topology #homotopy-theory #fibration #obstruction-theory
141
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Can the (extended) Möbius strip be found as the torus $T^2$ minus some embedded $S^1$?

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#general-topology #algebraic-topology
191
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Unique representation, Bott & Tu, Poincaré's Lemma.

Published on
#differential-geometry #algebraic-topology #differential-topology #differential-forms
110
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Intrinsic description of fiber bundle with given structure group

Published on
#differential-geometry #algebraic-topology
351
Views

Decomposition of forms in the proof of Poincaré's lemma

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#algebraic-topology #differential-topology #differential-forms
179
Views

torus covering map is regular

Published on
#algebraic-topology
188
Views

Identifying 3 sides of a polygon.

Published on
#general-topology #algebraic-topology #cw-complexes
692
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Attaching maps of products of CW-complexes.

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#general-topology #algebraic-topology #cw-complexes
1.5k
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Lie bracket of vector fields is a vector field

Published on
#algebraic-topology #manifolds #lie-groups #lie-algebras #vector-fields
185
Views

Proof of fixed point theorem on $D^1$ using the technique used in Brouwer's fixed point theorem.

Published on
#algebraic-topology #continuity #fixed-point-theorems #fundamental-groups #retraction
824
Views

Show that any cell complex is homotopy equivalent to a CW complex

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#general-topology #algebraic-topology #homotopy-theory #geometric-topology #cw-complexes
131
Views

Dimension of Simplical circle

Published on
#general-topology #algebraic-topology
98
Views

Fundamental group of $\{z\in\mathbb{C} \mid |z|\geq 1\}$

Published on
#algebraic-topology
179
Views

Finite connected poset is contractible

Published on
#algebraic-topology #order-theory #simplicial-stuff
226
Views

Integrating cohomology classes

Published on
#algebraic-topology #differential-topology

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