Question

Show something is quasi-isomorphism by showing pullback is quasi-isomorphism.

score 19 · Answer 1 · 2026-03-25 04:40:20

19

Views

Show something is quasi-isomorphism by showing pullback is quasi-isomorphism.

Published on 25 Mar 2026 - 4:40

score 125 · Answer 2 · 2026-03-26 12:48:32

125

Views

Why is it not possible to define the necessity operator internally $\Box: \Omega \to \Omega$ in a topos?

Published on 26 Mar 2026 - 12:48

score 194 · Answer 3 · 2026-03-29 03:50:33

194

Views

Grothendieck Topology on the Category of Elements

Published on 29 Mar 2026 - 3:50

score 100 · Answer 4 · 2015-02-03 17:18:49

100

Views

category of sheaves over an object

Published on 03 Feb 2015 - 17:18

score 185 · Answer 5 · 2015-02-11 22:28:38

185

Views

A Question on a claim regarding the notion of "space" in "Indiscrete Thoughts"

Published on 11 Feb 2015 - 22:28

score 214 · Answer 6 · 2015-02-23 21:19:53

214

Views

The terminal object comes for free in the definition of a subobject classifier

Published on 23 Feb 2015 - 21:19

score 206 · Answer 7 · 2015-02-26 16:18:36

206

Views

When defining a Grothendieck pretopology,can we get away with less than the fibre product axiom?

Published on 26 Feb 2015 - 16:18

score 234 · Answer 8 · 2015-02-28 01:12:17

234

Views

is the property of representability of a sheaf on the big etale site checkable on the small site?

Published on 28 Feb 2015 - 1:12

score 460 · Answer 9 · 2015-03-16 00:37:47

460

Views

Can a general version of the covariant powerset monad be derived from the universal property of power objects?

Published on 16 Mar 2015 - 0:37

score 171 · Answer 10 · 2015-03-20 20:49:33

171

Views

Does internalization loses informations everywhere?

Published on 20 Mar 2015 - 20:49

score 1.8k · Answer 11 · 2015-03-21 20:33:16

1.8k

Views

When does Sheafification commute with direct image?

Published on 21 Mar 2015 - 20:33

score 230 · Answer 12 · 2015-03-22 14:37:49

230

Views

Terminal object in $Set^{C^{op}}$ and subobject classifier.

Published on 22 Mar 2015 - 14:37

score 244 · Answer 13 · 2015-03-22 19:39:13

244

Views

Subobject classifier in $Set^{C^{op}}$

Published on 22 Mar 2015 - 19:39

score 363 · Answer 14 · 2015-04-02 22:32:16

363

Views

Is Rel a topos?

Published on 02 Apr 2015 - 22:32

score 229 · Answer 15 · 2015-04-02 22:58:36

229

Views

Examples of certain types of toposes

Published on 02 Apr 2015 - 22:58

List Question

Show something is quasi-isomorphism by showing pullback is quasi-isomorphism.

Why is it not possible to define the necessity operator internally $\Box: \Omega \to \Omega$ in a topos?

Grothendieck Topology on the Category of Elements

category of sheaves over an object

A Question on a claim regarding the notion of "space" in "Indiscrete Thoughts"

The terminal object comes for free in the definition of a subobject classifier

When defining a Grothendieck pretopology,can we get away with less than the fibre product axiom?

is the property of representability of a sheaf on the big etale site checkable on the small site?

Can a general version of the covariant powerset monad be derived from the universal property of power objects?

Does internalization loses informations everywhere?

When does Sheafification commute with direct image?

Terminal object in $Set^{C^{op}}$ and subobject classifier.

Subobject classifier in $Set^{C^{op}}$

Is Rel a topos?

Examples of certain types of toposes

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