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Section 2.1 – Undefined terms, postulates, segments and angles
Section 2.1 – Undefined terms, postulates, segments and angles

... Postulate 2.1 – Every line contains at least two distinct points. Postulate 2.2 – Two points are contained in one and only one line. Postulate 2.3 – If two points are in a plane the line containing these points is also in the plane. Postulate 2.4 – Three non-collinear points are contained in one and ...
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Grobner

... (adding) new element(s) to it. – Algebraic Extension: • Adjoin an element u that is a root of a polynomial (of degree m) in k[x]. – Resulting elements in extended field k(u) are of form: a0  a1u  a2u 2   am1u m1 – e.g. extending real numbers to complex numbers by adjoining i » i is root of x2+ ...
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Geometry Study Sheet
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... Two or more coplanar circles with the same center are called concentric circles. Two circles are congruent/ equal if they have congruent/equal radii. A point is in the interior of a circle if its distance from the center is less than the radius. A point is in the exterior of a circle if its distance ...
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Midterm Review Worksheet

Galois Groups and Fundamental Groups
Galois Groups and Fundamental Groups

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isosceles triangles

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Polynomials and Taylor`s Approximations

... In elementary algebra, quadratic formula are given for solving all second degree polynomial equations in one variable. There are also formulae for the cubic and quartic equations. For higher degrees, Abel–Ruffini theorem asserts that there can not exist a general formula, only numerical approximatio ...
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Dessin d'enfant

In mathematics, a dessin d'enfant is a type of graph embedding used to study Riemann surfaces and to provide combinatorial invariants for the action of the absolute Galois group of the rational numbers. The name of these embeddings is French for a ""child's drawing""; its plural is either dessins d'enfant, ""child's drawings"", or dessins d'enfants, ""children's drawings"".Intuitively, a dessin d'enfant is simply a graph, with its vertices colored alternating black and white, embedded in an oriented surface that, in many cases, is simply a plane. For the coloring to exist, the graph must be bipartite. The faces of the embedding must be topological disks. The surface and the embedding may be described combinatorially using a rotation system, a cyclic order of the edges surrounding each vertex of the graph that describes the order in which the edges would be crossed by a path that travels clockwise on the surface in a small loop around the vertex.Any dessin can provide the surface it is embedded in with a structure as a Riemann surface. It is natural to ask which Riemann surfaces arise in this way. The answer is provided by Belyi's theorem, which states that the Riemann surfaces that can be described by dessins are precisely those that can be defined as algebraic curves over the field of algebraic numbers. The absolute Galois group transforms these particular curves into each other, and thereby also transforms the underlying dessins.For a more detailed treatment of this subject, see Schneps (1994) or Lando & Zvonkin (2004).
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