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  2. Pencil (geometry) - Wikipedia

    en.wikipedia.org/wiki/Pencil_(geometry)

    Some lines in the pencil through A. In geometry, a pencil is a family of geometric objects with a common property, for example the set of lines that pass through a given point in a plane, or the set of circles that pass through two given points in a plane.

  3. File:Geometry for Elementary School.pdf - Wikipedia

    en.wikipedia.org/wiki/File:Geometry_for...

    2007-04-25 18:16 Whiteknight 1275×1650× (1355429 bytes) A PDF version for [[Geometry for elementary school]], based on the print version of that book. Created by myself using PDF24. Created by myself using PDF24.

  4. Geometric Exercises in Paper Folding - Wikipedia

    en.wikipedia.org/wiki/Geometric_Exercises_in...

    First Lessons drew inspiration from Fröbel's gifts in setting exercises based on paper-folding, and from the book Elementary Geometry: Congruent Figures by Olaus Henrici in using a definition of geometric congruence based on matching shapes to each other and well-suited for folding-based geometry. [1] In turn, Geometric Exercises in Paper ...

  5. List of books about polyhedra - Wikipedia

    en.wikipedia.org/wiki/List_of_books_about_polyhedra

    Beginner's Book of Modular Origami Polyhedra: The Platonic Solids, 2008. Modular Origami Polyhedra, also with Lewis Simon, 2nd ed., 1999. [5] Mitchell, David (1997). Mathematical Origami: Geometrical Shapes by Paper Folding. Tarquin. ISBN 978-1-899618-18-7. [6] Montroll, John (2009). Origami Polyhedra Design. A K Peters. ISBN 9781439871065. [7]

  6. La Géométrie - Wikipedia

    en.wikipedia.org/wiki/La_Géométrie

    Book I is titled Problems Which Can Be Constructed by Means of Circles and Straight Lines Only. In this book he introduces algebraic notation that is still in use today. The letters at the end of the alphabet, viz., x , y , z , etc. are to denote unknown variables, while those at the start of the alphabet, a , b , c , etc. denote constants.

  7. Viewpoints: Mathematical Perspective and Fractal Geometry in ...

    en.wikipedia.org/wiki/Viewpoints:_Mathematical...

    The first seven chapters of the book concern perspectivity, while its final two concern fractals and their geometry. [1] [2] Topics covered within the chapters on perspectivity include coordinate systems for the plane and for Euclidean space, similarity, angles, and orthocenters, one-point and multi-point perspective, and anamorphic art.

  8. Éléments de géométrie algébrique - Wikipedia

    en.wikipedia.org/wiki/Éléments_de_géométrie...

    Grothendieck's incomplete notes on EGA V can be found at Grothendieck Circle. In historical terms, the development of the EGA approach set the seal on the application of sheaf theory to algebraic geometry, set in motion by Serre's basic paper FAC. It also contained the first complete exposition of the algebraic approach to differential calculus ...

  9. Deformation (mathematics) - Wikipedia

    en.wikipedia.org/wiki/Deformation_(mathematics)

    The most salient deformation theory in mathematics has been that of complex manifolds and algebraic varieties.This was put on a firm basis by foundational work of Kunihiko Kodaira and Donald C. Spencer, after deformation techniques had received a great deal of more tentative application in the Italian school of algebraic geometry.

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