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15
282
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Second Stiefel-Whitney class of self-dual two forms of four manifolds

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#riemannian-geometry #characteristic-classes #hodge-theory #4-manifolds
272
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Every knot is slice, find the error in the following argument

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#differential-topology #knot-theory #4-manifolds
179
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Knot Traces and Trace Lemma

Published on
#knot-theory #4-manifolds
58
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Clarification on constructing a smooth map near singular points in Miller and Piccirillo's proof

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#knot-theory #4-manifolds
164
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$\mathbb{C}P^2$ is not diffeomorphic to $\overline{\mathbb{C}P^2}$

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#algebraic-topology #manifolds #geometric-topology #4-manifolds
61
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Orthogonal vectors in 4D

Published on
#geometry #vectors #rotations #4-manifolds
21
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Lefschetz fibration on product of surfaces

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#geometric-topology #symplectic-geometry #low-dimensional-topology #4-manifolds
83
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Surgery on smooth four-manifold preserves the intersection form

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#smooth-manifolds #homology-cohomology #surgery-theory #4-manifolds
42
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Intersection between torsion cycles and free cycles

Published on
#intersection-theory #torsion-groups #4-manifolds
48
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Intersection Form from a Kirby Diagram

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#smooth-manifolds #geometric-topology #4-manifolds #kirby-diagram
52
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Showing a 4-manifold is contractible

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#smooth-manifolds #geometric-topology #4-manifolds #kirby-diagram
142
Views

Understanding $\mathbb{C}P^2$

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#differential-geometry #algebraic-topology #differential-topology #low-dimensional-topology #4-manifolds
357
Views

Property of second Stiefel-Whitney class?

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#algebraic-topology #differential-topology #homology-cohomology #characteristic-classes #4-manifolds
252
Views

Visualizing Nash Equilibria of a 4 dimensional matrix

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#game-theory #coordinate-systems #visualization #nash-equilibrium #4-manifolds
185
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How can we assume the first homology group of the complement is zero when constructing a Casson handle?

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#differential-topology #homotopy-theory #geometric-topology #fundamental-groups #4-manifolds

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