<ruby id="d9npn"></ruby>

      <sub id="d9npn"><progress id="d9npn"></progress></sub>

      <nobr id="d9npn"></nobr>

      <rp id="d9npn"><big id="d9npn"><th id="d9npn"></th></big></rp>

      <th id="d9npn"><meter id="d9npn"></meter></th>

      Stack Exchange Network

      Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

      Visit Stack Exchange

      Questions tagged [ag.algebraic-geometry]

      for questions on algebraic geometry, including algebraic varieties, stacks, sheaves, schemes, moduli spaces, complex geometry, quantum cohomology.

      1
      vote
      0answers
      59 views

      Linear Morphism of Schemes

      Let $U$ be an arbitrary scheme and we consider the schematic fiber product $\mathbb{A}^1 _U = \mathbb{A}^1 _{\mathbb{Z}} \times_{\mathbb{Z}} U$. My question referer to Bosch's "linear morphisms" (of ...
      3
      votes
      0answers
      78 views

      $\infty$-categorical understanding of Bridgeland stability conditions?

      On triangulated categories we have a notion of Bridgeland stability conditions. Is there any known notion of "derived stability conditions" on a stable $\infty$ category $C$ such that they become ...
      3
      votes
      1answer
      55 views

      Topological realisation of a stack (explicit description)

      Let $X$ be an Artin stack over $k=\mathbf{C}$. I've heard that $X$ has a topological realisation, but I've not been able to find an explicit decription. My first guess would be: take a smooth cover $...
      4
      votes
      1answer
      197 views

      Applications of the idea of deformation in algebraic geometry and other areas?

      The idea of proving something by deforming the general case to some special cases is very powerful. For example, one can prove certain equalities by regarding both sides as functions/sheaves, and show ...
      0
      votes
      0answers
      52 views

      Does positivstellensatz and SOS proof system help here?

      I have a system of $m$ homogeneous degree $2$ polynomial equations in $\mathbb Z[x_1,\dots,x_n]$ where $m=poly(n)$. Take $$f_1(x_1,\dots,x_n)=0$$ $$\dots$$ $$f_m(x_1,\dots,x_n)=0$$ to be the system. ...
      0
      votes
      0answers
      65 views

      When does the image of a morphism of schemes support scheme structure?

      Let $Y$ be a qcqs scheme, $f:X\rightarrow Y$ be a quasi-compact morphism locally of finite presentation. Are there any conditions on $f$ which do not force $f(X)$ be open or closed but force it to be ...
      1
      vote
      0answers
      45 views

      An injection from curve to projective plane is subscheme inclusion

      Let $X$ be a connected scheme, $X\rightarrow \mathrm{Spec}\,\mathbb{C}$ be a morphism of finite type and relative dimension 1. Assume that there is a $\mathbb{C}$-morphism $f:X\rightarrow \mathbb{P}^2$...
      2
      votes
      0answers
      40 views

      Minimal Embedding for flags varieties

      I would like to understand how to construct a parametization of a flag variety $F(V,n_1,\ldots,n_r)\subseteq \mathbb{P}^N$ in its minimal embedding. First, I would like to know if there is a closed ...
      3
      votes
      0answers
      85 views

      If there are nontrivial maps $H\mathbb{Z}^{top}\to MU$ then there are nontrivial maps $H\mathbb{Z}\to MGL$?

      Let $H\mathbb{Z}^{top}$ be the Eilenberg-MacLane spectrum and $MU$ be the complex cobordism spectrum. Consider now the motivic counterparts of the above spectral, namely $MGL$ (the motivic cobordism)...
      2
      votes
      0answers
      64 views

      The category of numerical motives over a finite field is generated by Artin motives and abelian varieties?

      I heard from someone that people believe the category of numerical motives over a finite field is generated by Artin motives and abelian varieties. What is the precise expection? How much do we know ...
      1
      vote
      0answers
      73 views

      Moduli space of almost complex structures as an algebro-geometric object

      Let $M$ be a closed real-analytic manifold of dimension $2n$. Is it possible to make sense of the moduli space of real-analytic almost complex structures on $M$ as an algebro-geometric object (...
      3
      votes
      1answer
      111 views

      Non- simplicity of $\text{Bir}(\mathbb{P}_\mathbb{R}^2)$

      In this paper: https://perso.univ-rennes1.fr/serge.cantat/Articles/nsgc-acta-c.pdf the authors said that their article 'directly implied' that $\text{Bir}(\mathbb{P}_\mathbb{R}^2)$ is not simple as ...
      0
      votes
      0answers
      43 views

      Non-Compact Example where Putinar's Positivstellensatz Fails

      One way to state Putinar's Positivstellensatz is as follows: a compact set polynomial inequalities $\mathcal{P} = \{P_1(x) \geq 0, \ldots, P_m(x) \geq 0\}$ is unsatisfiable if and only if there exists ...
      2
      votes
      0answers
      81 views

      Rationality of motivic zeta function for smooth Fano varieties

      Assume the base field is complex number, and the coefficent is the Grothendieck ring of varieties (or it's localization at $[\mathbb L]$). We know the motivic zeta function for smooth projective ...
      0
      votes
      0answers
      95 views

      Do many homogeneous polynomials help in faster integer root extraction?

      Given $n$ homogeneous algebraically independent total degree $2$ polynomials with no $x_1^2,\dots,x_n^2$ variable in $\mathbb Z[x_1,\dots,x_n]$ with promise that it has non-zero integer roots with ...

      15 30 50 per page
      特码生肖图
      <ruby id="d9npn"></ruby>

          <sub id="d9npn"><progress id="d9npn"></progress></sub>

          <nobr id="d9npn"></nobr>

          <rp id="d9npn"><big id="d9npn"><th id="d9npn"></th></big></rp>

          <th id="d9npn"><meter id="d9npn"></meter></th>

          <ruby id="d9npn"></ruby>

              <sub id="d9npn"><progress id="d9npn"></progress></sub>

              <nobr id="d9npn"></nobr>

              <rp id="d9npn"><big id="d9npn"><th id="d9npn"></th></big></rp>

              <th id="d9npn"><meter id="d9npn"></meter></th>