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Results tagged with reference-request
Search options not deleted
user 22247
This tag is used if a reference is needed in a paper or textbook on a specific result.
3
votes
The category of posets
There is an example of a model category structure on a preorder of families of sets, defined as follows: $X\leq Y$ iff every element $x\in X$ is bounded $x\leq y_x$ by some element of $y_x\in Y$;
fami …
5
votes
1
answer
680
views
comparing Hodge structures on cohomology of conjugate varieties
What can one say about the relation between the Hodge decompositions
of $H^\*(X,C)$ and $H^{*}(X_\sigma,C)$
for a complex algebraic smooth projective variety $X$ and $\sigma$ an automorphism
of the f …
- 468
2
votes
0
answers
231
views
a partial order not dense iff a measurable exists
For $\kappa>0$ a regular cardinal, let $Ht_\kappa$ denote the following partial quasi-order:
(i) elements(objects) of $Ht_\kappa$ are classes X of sets of size $\kappa$
with the property that,
($<_\ …
- 468
10
votes
0
answers
430
views
Discretifications of the fundamental group functor
Grothendieck calls a "discretification" of a profinite group $\widehat G$, a
discrete group $G$ whose profinite completion is isomorphic to $\widehat G$.
Does Grothendieck also define a notion of th …
- 468