Geometric algorithms

Geometric modeling

Geometric modeling is a branch of applied mathematics and computational geometry that studies methods and algorithms for the mathematical description of shapes. The shapes studied in geometric modeling are mostly two- or three-dimensional, although many of its tools and principles can be applied to sets of any finite dimension. Today most geometric modeling is done with computers and for computer-based applications. Two-dimensional models are important in computer typography and technical drawing. Three-dimensional models are central to computer-aided design and manufacturing (CAD/CAM), and widely used in many applied technical fields such as civil and mechanical engineering, architecture, geology and medical image processing. Geometric models are usually distinguished from procedural and object-oriented models, which define the shape implicitly by an opaque algorithm that generates its appearance. They are also contrasted with digital images and volumetric models which represent the shape as a subset of a fine regular partition of space; and with fractal models that give an infinitely recursive definition of the shape. However, these distinctions are often blurred: for instance, a digital image can be interpreted as a collection of colored squares; and geometric shapes such as circles are defined by implicit mathematical equations. Also, a fractal model yields a parametric or implicit model when its recursive definition is truncated to a finite depth. Notable awards of the area are the John A. Gregory Memorial Award and the Bézier award. (Wikipedia).

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Geometric Algebra - The Matrix Representation of a Linear Transformation

In this video, we will show how matrices as computational tools may conveniently represent the action of a linear transformation upon a given basis. We will prove that conventional matrix operations, particularly matrix multiplication, conform to the composition of linear transformations.

From playlist Geometric Algebra

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What is a geometric mean

Learn about the geometric mean of numbers. The geometric mean of n numbers is the nth root of the product of the numbers. To find the geometric mean of n numbers, we first multiply the numbers and then take the nth root of the product.

From playlist Geometry - GEOMETRIC MEAN

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Adding Vectors Geometrically: Dynamic Illustration

Link: https://www.geogebra.org/m/tsBer5An

From playlist Trigonometry: Dynamic Interactives!

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Geometrical Optics -- Day 4

Working with lenses, trying to visualize refractive indices. Things are going well-ish. -- Watch live at https://www.twitch.tv/simuleios

From playlist Geometrical Optics

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Geometric Algebra - Linear Transformations, Outermorphism, and the Determinant

In this video, we will review some basic concepts from linear algebra, such as the linear transformation, prove important theorems which ground matrix operations, extend the linear transformation on vectors to higher-graded elements to bivectors and trivectors, and define the determinant o

From playlist Geometric Algebra

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A solar system, a simulation made with Excel

An Excel simulation of the solar system. You can see how things are recursively computed: the mutual gravity force from the locations, the accelerations, the velocities, and finally the updated locations. The solar eclipse is also shown. This is clip is intended to illustrate Chapter 24 Ap

From playlist Physics simulations

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What is Math Modeling? Video Series Part 5: Getting a Solution

Mathematical modeling uses math to represent, analyze, make predictions, or otherwise provide insight into real world phenomena. This episode, number five in this new seven-part series, guides you through the process of finding a solution to your mathematical model. Here’s where you’ll fi

From playlist M3 Challenge

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Using the geometric mean to determine the missing parts of a triangle

Learn about the geometric mean of numbers. The geometric mean of n numbers is the nth root of the product of the numbers. To find the geometric mean of n numbers, we first multiply the numbers and then take the nth root of the product.

From playlist Geometry - GEOMETRIC MEAN

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Emily Stark: Action rigidity for free products of hyperbolic manifold groups

CIRM VIRTUAL EVENT Recorded during the meeting"Virtual Geometric Group Theory conference " the May 22, 2020 by the Centre International de Rencontres Mathématiques (Marseille, France) Filmmaker: Guillaume Hennenfent Find this video and other talks given by worldwide mathematicians on CIRM

From playlist Virtual Conference

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what is your mental model of math?

Most people rarely, if ever, think about their mental models but having a good mental model about a subject enables the development of expertise in that subject. This video proposes a mental model about an area of mathematics. The model is actionable, simple, and hierarchical. Contents: 0

From playlist Summer of Math Exposition 2 videos

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Matthias Hutzler - Gluing classifying toposes

Talk at the school and conference “Toposes online” (24-30 June 2021): https://aroundtoposes.com/toposesonline/

From playlist Toposes online

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Quantization By Branes And Geometric Langlands Lecture 2 by Edward Witten

PROGRAM : QUANTUM FIELDS, GEOMETRY AND REPRESENTATION THEORY 2021 (ONLINE) ORGANIZERS : Aswin Balasubramanian (Rutgers University, USA), Indranil Biswas (TIFR, india), Jacques Distler (The University of Texas at Austin, USA), Chris Elliott (University of Massachusetts, USA) and Pranav Pan

From playlist Quantum Fields, Geometry and Representation Theory 2021 (ONLINE)

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Laurent Lafforgue - 3/4 Classifying toposes of geometric theories

Course at the school and conference “Toposes online” (24-30 June 2021): https://aroundtoposes.com/toposesonline/ Slides: https://aroundtoposes.com/wp-content/uploads/2021/07/LafforgueSlidesToposesOnline.pdf The purpose of these lectures will be to present the theory of classifying topose

From playlist Toposes online

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Lecture 1: Invitation to topos theory

This talk introduces the motivating question for this semester of the Curry-Howard seminar, which is how to organise mathematical knowledge using topoi. The approach sketched out in the talk is via first-order theories, their associated classifying topoi, and adjoint pairs of functors betw

From playlist Topos theory seminar

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First look at PyTorch Geometric: PyG 2.0 (Nov 2021)

Discover together with me PyTorch Geometric (v2). PyG to code and train Graph Neural Networks (GNNs) for applications w/ graph structured data. Various methods for deep learning on graphs, also known as geometric deep learning, from a variety of published papers (see Arxiv for AI, GNN, GC

From playlist Learn Graph Neural Networks: code, examples and theory

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On Finite Types That Are Not h-Sets - Sergey Melikhov

Sergey Melikhov Steklov Mathematical Institute; Member, School of Mathematics February 14, 2013 For more videos, visit http://video.ias.edu

From playlist Mathematics

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Ming Ng - Adelic Geometry via Topos Theory

Talk at the school and conference “Toposes online” (24-30 June 2021): https://aroundtoposes.com/toposesonline/ Slides: https://aroundtoposes.com/wp-content/uploads/2021/07/NgSlidesToposesOnline.pdf Joint work with Steve Vickers In this talk, I will give a leisurely introduction to the t

From playlist Toposes online

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Visualizing Solutions to Linear Systems - - 2D & 3D Cases Geometrically

Description: We look at the geometric picture given by systems of linear equations. In particular, we will be able to: *Sketch what the solution to a SINGLE 2D or 3D linear equation looks like (including special cases like 0x+0y=0) * Sketch the solution to a system or 2D or 3D linear equat

From playlist Linear Algebra (Full Course)

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Gauge Theory and the Analytic Approach to Geometric Langlands - Edward Witten

Clay Research Conference Topic: Gauge Theory and the Analytic Approach to Geometric Langlands Speaker: Edward Witten Affiliation: Professor, School of Natural Sciences Date: September 30, 2021 Recently P. Etingof, E. Frenkel, and D. Kazhdan, following earlier contributions by R. Langl

From playlist Mathematics

Related pages

Technical drawing | Space partitioning | Computational topology | Dimension | List of interactive geometry software | Conformal geometry | Computational geometry | Parametric surface | Procedural modeling | Subdivision surface | Digital image | Parametric equation | Fractal | Digital geometry | Solid modeling | Algorithm | Circle | Applied mathematics