Geometry
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About this ebook
All topics concerning geometry are presented in this book:
Euclidean plane geometry
euclidean solid geometry
analytic geometry in the plane
projective geometry
analytic geometry in space
non-Euclidean geometries
combinatorial geometry
discrete geometry
fractal geometry
differential geometry
Simone Malacrida
Simone Malacrida (1977) Ha lavorato nel settore della ricerca (ottica e nanotecnologie) e, in seguito, in quello industriale-impiantistico, in particolare nel Power, nell'Oil&Gas e nelle infrastrutture. E' interessato a problematiche finanziarie ed energetiche. Ha pubblicato un primo ciclo di 21 libri principali (10 divulgativi e didattici e 11 romanzi) + 91 manuali didattici derivati. Un secondo ciclo, sempre di 21 libri, è in corso di elaborazione e sviluppo.
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Geometry - Simone Malacrida
Table of Contents
Table of Contents
Geometry
INTRODUCTION
GEOMETRY: BASIC CONCEPTS
EUCLIDEAN PLANE GEOMETRY
EUCLIDEAN SOLID GEOMETRY
ANALYTICAL GEOMETRY IN THE PLANE
ANALYTICAL GEOMETRY IN SPACE
NON-EUCLIDEAN GEOMETRY
COMBINATORY GEOMETRY
DISCRETE GEOMETRY
FRACTAL GEOMETRY
DIFFERENTIAL GEOMETRY
Geometry
Geometry
SIMONE MALACRIDA
All topics concerning geometry are presented in this book:
Euclidean plane geometry
euclidean solid geometry
analytic geometry in the plane
projective geometry
analytic geometry in space
non-Euclidean geometries
combinatorial geometry
discrete geometry
fractal geometry
differential geometry
Simone Malacrida (1977)
Engineer and writer, has worked on research, finance, energy policy and industrial plants.
ANALYTICAL INDEX
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INTRODUCTION
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I – GEOMETRY: BASIC CONCEPTS
Definitions
Euclid's postulates
Other definitions
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II – EUCLIDEAN PLANE GEOMETRY
Definitions
Circumference
Ellipse
Parable
Polygons: definitions
Triangle
Quadrilaterals
More polygons
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III - EUCLIDEAN SOLID GEOMETRY
Definitions
Sphere
Cone
Cylinder
Polyhedra: definitions
Pyramid
Prism
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IV - ANALYTICAL GEOMETRY IN THE PLANE
Definitions
Translation and distance
Practical applications
The straight line in the Cartesian plane
Properties of the straight line in the Cartesian plane
The parabola in the Cartesian plane
Circumference
Ellipse
Hyperbole
General considerations on conics
Generalization of analytic geometry in the plane
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V - ANALYTICAL GEOMETRY IN SPACE
The plane in space
The straight line in space
Surfaces in space
The quadrics
Other surfaces
Projective geometry
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VI - NON-EUCLIDEAN GEOMETRIES
Introduction
Elliptical geometry
Spherical geometry
Hyperbolic geometry
Projective geometry
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VII - COMBINATORY GEOMETRY
Introduction
Graphs
Trees
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VIII - DISCRETE GEOMETRY
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IX - FRACTAL GEOMETRY
Introduction
Types of fractals
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X - DIFFERENTIAL GEOMETRY
Introduction
Operations
INTRODUCTION
INTRODUCTION
Geometry is certainly one of the most important fields of mathematics and this has been known since ancient times.
The geometric study has always supported and supported the mathematical one, generating a series of reciprocal influences that have lasted up to the present day.
It is useless to recall the enormous applications of geometry not only at a scientific and technological level, but in everyday life.
This book deals with all aspects of geometry, from the elementary one that is taught from the first years of school, up to the most advanced knowledge at the university level.
The first three chapters introduce the geometric discourse, substantially as already known by the Greeks, exposing the elementary concepts and implications of plane geometry and solid geometry within the Euclidean vision.
The fourth and fifth chapters instead draw inspiration from Descartes' studies on analytical geometry and extend the concepts of high school up to university-level knowledge, going to study analytical geometry in space and on the plane through increasingly sophisticated formalisms.
The sixth chapter is dedicated to the introduction of non-Euclidean geometries and to the fundamental study that emerged for two centuries at the mathematical level.
The last four chapters make us understand how the role of geometry in modern society has evolved exponentially.
Geometry has connections with algebra and combinatorics, with logic and with analysis.
There are geometries of different types, among which we mention the discrete, the combinatorial and the fractal.
Particularly important for its physical and mathematical consequences is differential geometry, presented in the tenth and final chapter.
This book therefore wants to be a summa of geometry in every possible mathematical application.
I
GEOMETRY: BASIC CONCEPTS
GEOMETRY: BASIC CONCEPTS
Definitions
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Geometry is that branch of mathematics that deals with shapes and figures in a given setting.
Below we give the foundations of elementary geometry, largely developed already in ancient Greece.
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The primitive concept of geometry is the point, conceived as a dimensionless and indivisible entity, which characterizes the position and is characterized by it .
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An infinite and successive set of points is called a segment , if this set is delimited by two points called extremes.
Two segments are consecutive if they have an end point in common, while they are external if they have no point in common.
Two segments are said to be incident if they have only one point in common, called the point of intersection , which however is not an extreme.
The midpoint of a segment is the point that exactly divides the segment in half.
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An infinite and successive set of points is called a straight line , if this set is not bounded by any end point, while it is called a semi-line if there is only one end point.
A segment can therefore be seen as part of a straight line.
Two consecutive segments are adjacent if they belong to the same line.
Lines, segments and semi-lines are characterized by a single dimension called length.
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The geometric entity characterized by two dimensions, called length and height, is the plane , while the one characterized by three dimensions (in addition to those mentioned there is the width) is called space . Plane geometry deals with the study of the two-dimensional case, solid geometry with the three-dimensional case.
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Two straight lines or two segments are said to be coplanar if they lie in the same plane, otherwise they are called skew .
In geometry, points are indicated with capital letters, segments with capital letters of the two extremes barred at the top by a line, while straight lines and semi-lines with small letters.
Furthermore, all geometric dimensions are, by definition, positive.
Two segments, two straight lines or two semi-lines are said to coincide if and only if all the points present in the first