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15
113
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Problems with Vignéras' proof of Skolem-Noether th. in "Arithmétiques des Algèbres de Quaternions"

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#abstract-algebra #modules #quaternions #morphism
60
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Representing object for a functor mapping a category to composable morphisms

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#category-theory #functors #morphism #natural-transformations #hom-functor
82
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A monoid $M$ is $\omega$-presentable in the category $M$-$\mathbf{Set}$

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#category-theory #order-theory #limits-colimits #monoid #morphism
220
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Smooth morphisms of schemes

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#algebraic-geometry #schemes #morphism
57
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$X\times Y$ and the product topology

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#algebraic-geometry #product-space #affine-varieties #zariski-topology #morphism
147
Views

Show every hyperelliptic curve admits a morphism of degree 2

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#algebraic-geometry #elliptic-curves #morphism
279
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Objects of categories with no morphisms from them other than endomorphisms

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#category-theory #universal-property #morphism
74
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Monomorphism under a functor

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#category-theory #functors #morphism
57
Views

Understanding rational maps from Shafarevich

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#algebraic-geometry #morphism
62
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Is Inverse of bijective morphism also morphism?

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#algebraic-geometry #arithmetic-geometry #morphism
51
Views

What are colored morphisms/arrows intended to mean in these diagrams?

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#category-theory #universal-property #morphism #natural-transformations #diagram-chasing
43
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Terminology: (Co)equalizer of a family of morphisms?

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#abstract-algebra #category-theory #terminology #limits-colimits #morphism
37
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Minimally sufficient condition for composability of quiver morphisms?

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#category-theory #morphism #quiver
841
Views

Can two fields which are extensions of one another be non isomorphic

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#ring-theory #field-theory #extension-field #ring-isomorphism #morphism
41
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How to define linear transformations: $\text{Ker }b \to \text{Ker } c,$ $\text{Im }b \to \text{Im } c,$ and $\text{Coker }b \to \text{Coker } c?$

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#linear-algebra #morphism

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