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We study deformations of complex projective varieties that are homotopically or homologically trivial. We formulate several conjectures and give some examples and partial answers.

Complex Variables · Mathematics 2012-01-16 Javier Fernandez de Bobadilla , János Kollár

We discuss two simple but useful observations that allow the construction of modular forms from given ones using invariant theory. The first one deals with elliptic modular forms and their derivatives, and generalizes the Rankin-Cohen…

Number Theory · Mathematics 2023-04-10 Fabien Cléry , Gerard van der Geer

Normal form theory is developed deeply for planar smooth systems but has few results for piecewise-smooth systems because difficulties arise from continuity of the near-identity transformation, which is constructed piecewise. In this paper,…

Dynamical Systems · Mathematics 2025-06-17 Jiahao Li , Xingwu Chen , Weinian Zhang

We briefly review the main aspects of (Poincar\'e-Dulac) normal forms; we have a look at the non-uniqueness problem, and discuss one of the proposed ways to ``further reduce'' the normal forms. We also mention some convergence results.

Mathematical Physics · Physics 2007-05-23 G. Gaeta

We introduce the notion of "type" of a tableau, that allows us to define new families of tableaux including both balanced and standard Young tableaux. We use these new objects to describe the set of reduced decompositions of any…

Combinatorics · Mathematics 2016-03-11 François Viard

These notes outline some basic notions of Tropical Geometry and survey some of its applications for problems in classical (real and complex) geometry. To appear in the Proceedings of the Madrid ICM.

Algebraic Geometry · Mathematics 2007-05-23 Grigory Mikhalkin

The main purpose of this paper is to lay the foundations of a general theory which encompasses the features of the classical Hough transform and extend them to general algebraic objects such as affine schemes. The main motivation comes from…

Commutative Algebra · Mathematics 2012-02-09 Mauro C. Beltrametti , Lorenzo Robbiano

The concept of_refinement_ in type theory is a way of reconciling the "intrinsic" and the "extrinsic" meanings of types. We begin with a rigorous analysis of this concept, settling on the simple conclusion that the type-theoretic notion of…

Logic in Computer Science · Computer Science 2013-10-02 Paul-André Melliès , Noam Zeilberger

We introduce a notion of the ``explanation" of one (generalized) probabilistic model by another as particular kind of span in the category $\Prob$ of probabilistic models and morphisms. We show that explanations compose under a standard…

Quantum Physics · Physics 2026-03-09 John Harding , Alex Wilce

The main purpose of this paper is to give a new definition for the notion of group-groupoid. Also, several basic properties of group-groupoids are established.

Group Theory · Mathematics 2015-12-31 Mihai Ivan

Let $X$ be a variety over a complete nontrivially valued field $K$. We construct an algebraizable formal model for the analytification of $X$ in the case $X$ admits a closed embedding into a toric variety. By algebraizable we mean that the…

Algebraic Geometry · Mathematics 2023-03-27 Desmond Coles , Netanel Friedenberg

We give an explicit expression of the normalized characters of the symmetric group in terms of the contents of the partition labelling the representation.

Combinatorics · Mathematics 2008-02-29 Michel Lassalle

In this paper, we study normal complex contact metric manifolds and we get some general results on them. Moreover, we obtained the general expression of the curvature tensor field for arbitrary vector fields. Furthermore, we show that the…

Differential Geometry · Mathematics 2015-10-21 Aysel Turgut Vanli , Inan Unal

We will show that in any characteristic every nonsingular cubic surface is projectively isomorphic to the surface given by the octanomial normal form. This normal form is discovered by M. Panizzut, E. C. Sert\"oz, and B. Sturmfels in 2020…

Algebraic Geometry · Mathematics 2023-11-21 China Kaneko

Working in homotopy type theory, we provide a systematic study of homotopy limits of diagrams over graphs, formalized in the Coq proof assistant. We discuss some of the challenges posed by this approach to formalizing homotopy-theoretic…

Logic · Mathematics 2019-02-20 Jeremy Avigad , Chris Kapulkin , Peter LeFanu Lumsdaine

In this paper we introduce and study motives for rational homotopy types.

Algebraic Geometry · Mathematics 2017-07-14 Isamu Iwanari

We give the canonical normal form for the elements of the finite or infinite alternating groups using local stationary presentation of these groups.

Group Theory · Mathematics 2007-05-23 A. Vershik , M. Vsemirnov

Akama et al. systematically studied an arithmetical hierarchy of the law of excluded middle and related principles in the context of first-order arithmetic. In that paper, they first provide a prenex normal form theorem as a justification…

Logic · Mathematics 2021-07-01 Makoto Fujiwara , Taishi Kurahashi

Present notes can be viewed as an attempt to extend the notion of Schubert/Grothendieck polynomial to the context of an arbitrary algebraic oriented cohomology theory and, hence, of a commutative one-dimensional formal group law.

Rings and Algebras · Mathematics 2014-06-05 Kirill Zainoulline

Semi-simplicial and semi-cubical sets are commonly defined as presheaves over respectively, the semi-simplex or semi-cube category. Homotopy Type Theory then popularized an alternative definition, where the set of n-simplices or n-cubes are…

Logic in Computer Science · Computer Science 2025-07-22 Hugo Herbelin , Ramkumar Ramachandra
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