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Pontryagin class of self-dual forms on a 4-manifold

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#algebraic-topology #riemannian-geometry #characteristic-classes #4-manifolds
481
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Positive scalar curvature in dimension 4

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#differential-geometry #riemannian-geometry #4-manifolds
81
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$S^6$ as the total space of bundle

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#algebraic-topology #4-manifolds
113
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Area of Study for Four dimensional Space

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#differential-geometry #differential-topology #low-dimensional-topology #4-manifolds
972
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A Hodge dual computation on a $4$-dimensional Riemannian manifold

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#differential-geometry #riemannian-geometry #differential-forms #exterior-algebra #4-manifolds
351
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notation for connected sum $\#^n S^2 \times S^2$

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#general-topology #geometric-topology #spheres #4-manifolds
102
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How to think about exotic differentiable structures in manifolds?

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#manifolds #differential-topology #smooth-manifolds #low-dimensional-topology #4-manifolds
54
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Twisty cross notation

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#differential-topology #smooth-manifolds #4-manifolds
432
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Examples of 4-manifolds with nontrivial third Stiefel-Whitney class $w_3$.

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#algebraic-topology #characteristic-classes #4-manifolds
51
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About natural identifications in knot theory

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#algebraic-topology #geometric-topology #cobordism #4-manifolds
58
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Connecting the Fibres of a Lefschetz Fibration With Disconnected Fibres.

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#differential-geometry #differential-topology #symplectic-geometry #4-manifolds
48
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Notion of equivalence for intersection forms

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#quadratic-forms #4-manifolds
173
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Example of "practical" applications of Donaldson Invariants

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#algebraic-topology #differential-topology #4-manifolds #topological-quantum-field-theory
165
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Classification of line bundles over surfaces

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#smooth-manifolds #line-bundles #4-manifolds
194
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Closed orientable 4-manifolds with $H_2(M)\cong \mathbb{Z}$ do not admit free actions of $\mathbb{Z}/2$

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#geometry #algebraic-topology #4-manifolds #poincare-duality

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