Let $X$ be a topological space, $F$ a sheaf on $X$, given an automorphism $f\colon X\to X$, do we have an induced morphism $H^i(X,F)\to H^i(X,F)$ for any sheaf on $X$?(I can understand for $(X,f^*F)\to (Y,F)$, there's a map $H^i(Y,F)\to H^i(X,f^*F)$, given by $H^i(Y,F)\to H^i(Y,f_*f^*F)\to H^i(X,f^*F)$, where the last step is given by choosing an resolution of $f^*F\to I^\cdot$ and define by induced map on hypercohomology for $f_*f^*F\to f^*I^\cdot$, LHS viewed as complex concentrated at degree $0$)
2026-04-03 04:22:07.1775190127
Does action on $X$ define an action on cohomology $H^i(X,F)$?
44 Views Asked by user93417 https://math.techqa.club/user/user93417/detail At
1
There are 1 best solutions below
Related Questions in HOMOLOGY-COHOMOLOGY
- Are these cycles boundaries?
- Cohomology groups of a torus minus a finite number of disjoint open disks
- $f$ - odd implies $d(f)$ - odd, question to the proof
- Poincarè duals in complex projective space and homotopy
- understanding proof of excision theorem
- proof of excision theorem: commutativity of a diagram
- exact sequence of reduced homology groups
- Doubts about computation of the homology of $\Bbb RP^2$ in Vick's *Homology Theory*
- the quotien space of $ S^1\times S^1$
- Rational points on conics over fields of dimension 1
Related Questions in SHEAF-THEORY
- Is $ X \to \mathrm{CH}^i (X) $ covariant or contravariant?
- Question about notation for Čech cohomology and direct image of sheaves in Hartshorne
- Does sheafification preserve surjectivity?
- Image of a morphism of chain complexes of sheaves via direct/inverse image functor
- Tensor of a $k[X]$ module with the structure sheaf of an affine variety is a sheaf
- Sheafy definition for the tangent space at a point on a manifold?
- Whats the relationship between a presheaf and its sheafification?
- First isomorphism theorem of sheaves -- do you need to sheafify if the map is surjective on basis sets?
- An irreducible topological space $X$ admits a constant sheaf iff it is indiscrete.
- Why does a globally generated invertible sheaf admit a global section not vanishing on any irreducible component?
Related Questions in SHEAF-COHOMOLOGY
- Question about notation for Čech cohomology and direct image of sheaves in Hartshorne
- Image of a morphism of chain complexes of sheaves via direct/inverse image functor
- Does $H^2(X_{Zar},\mathcal{O}_X^\times)=0$ for $X$ a regular scheme?
- Computing the dimension of $H^0(X, \mathcal{O}_X(D))$, where $D \subset X$ is a divisor
- Is the cohomology of a stalk the same as the stalk of the cohomology sheaf?
- If $H^i(\tilde{X}, \mathcal{F}) = 0$, then is it true that $H^i(X, \mathcal{F}) = 0$?
- Conditions on $\mathcal{F}$ such that $\chi(\mathcal{F}) = 0$ for a coherent sheaf on a curve over $k$.
- Cohomology and inverse image of divisors
- $\dim H^0(X, \mathcal{O}_D) \leq 1 + \deg D$ when $-1 \leq \deg D \leq g - 1$
- Bott vanishing from the Euler sequence
Trending Questions
- Induction on the number of equations
- How to convince a math teacher of this simple and obvious fact?
- Find $E[XY|Y+Z=1 ]$
- Refuting the Anti-Cantor Cranks
- What are imaginary numbers?
- Determine the adjoint of $\tilde Q(x)$ for $\tilde Q(x)u:=(Qu)(x)$ where $Q:U→L^2(Ω,ℝ^d$ is a Hilbert-Schmidt operator and $U$ is a Hilbert space
- Why does this innovative method of subtraction from a third grader always work?
- How do we know that the number $1$ is not equal to the number $-1$?
- What are the Implications of having VΩ as a model for a theory?
- Defining a Galois Field based on primitive element versus polynomial?
- Can't find the relationship between two columns of numbers. Please Help
- Is computer science a branch of mathematics?
- Is there a bijection of $\mathbb{R}^n$ with itself such that the forward map is connected but the inverse is not?
- Identification of a quadrilateral as a trapezoid, rectangle, or square
- Generator of inertia group in function field extension
Popular # Hahtags
second-order-logic
numerical-methods
puzzle
logic
probability
number-theory
winding-number
real-analysis
integration
calculus
complex-analysis
sequences-and-series
proof-writing
set-theory
functions
homotopy-theory
elementary-number-theory
ordinary-differential-equations
circles
derivatives
game-theory
definite-integrals
elementary-set-theory
limits
multivariable-calculus
geometry
algebraic-number-theory
proof-verification
partial-derivative
algebra-precalculus
Popular Questions
- What is the integral of 1/x?
- How many squares actually ARE in this picture? Is this a trick question with no right answer?
- Is a matrix multiplied with its transpose something special?
- What is the difference between independent and mutually exclusive events?
- Visually stunning math concepts which are easy to explain
- taylor series of $\ln(1+x)$?
- How to tell if a set of vectors spans a space?
- Calculus question taking derivative to find horizontal tangent line
- How to determine if a function is one-to-one?
- Determine if vectors are linearly independent
- What does it mean to have a determinant equal to zero?
- Is this Batman equation for real?
- How to find perpendicular vector to another vector?
- How to find mean and median from histogram
- How many sides does a circle have?
Merely by transport of structure, there is a natural map (covariant in $f$) $H^i(X,F)\to H^i(X,f_*F)$; equivalently, replacing $f$ by its inverse, there is a natural map $H^i(X,f^*F)\to H^i(X,F)$ contravariant in $f$ (note that $f_*$ and $f^*$ are inverse functors when $f$ is a homeomorphism). However, there is no reason there should be a natural map $H^i(X,F)\to H^i(X,F)$ associated to $f$, because $f$ is only an automorphism of $X$, not of the pair $(X,F)$. I don't know how to prove rigorously that no such (sufficiently nice) natural map exists, but I see no reason at all to expect there to be one. If you are unconvinced, then I ask you: what do you think the map should be in the case $i=0$?