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hyperbolic pairs and basis
hyperbolic pairs and basis

... seen as the standard equation of a hyperbola. If we think of a quadratic form as generalizing norms – that is length, then we are observing that on a hyperbolic line length is not Euclidean, in fact, as the usual Euclidean length of (x, y), x2 + y 2 , gets large, the associated hyperbolic length get ...
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Sample pages 1 PDF
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... Theorem 2.5 (The rational root theorem). If x = p/q is a rational zero of a polynomial P(x) = an xn + · · · + a0 with integer coefficients and (p, q) = 1, then p | a0 and q | an . Theorem 2.6 (The fundamental theorem of algebra). Every nonconstant polynomial with coefficients in C has a complex root ...
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... Thus, the user continues to brace rhombi and test for distortions. If a shift about every ribbon is a rigid rotation, then we have a rigidly braced carpet. Now consider the inverse problem. Is it perhaps possible to remove some of the bracings without affecting the rigidity? Bracing and unbracing rh ...
Set 4 Special Congruent Triangles
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the isoperimetric problem on some singular surfaces
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on three classes of regular toroids
on three classes of regular toroids

... class T1 , it can easily be seen that a toroid with less than seven vertices does not exist. The model of the toroid, denoted by C0 , which is constructed on the basis of the data published by professor Ákos Császár at Budapest University who is a member of the Hungarian Academy of Sciences [2], app ...
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Introduction to OpenMesh (and Exercise 1)

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Dissection of a triangle into similar triangles

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... The following result follows from an immediate application of the Theorem of Alternatives and Farkas Lemma 1.3.2. Lemma 1.4.1. (i) (P) is unfeasible if and only if there exists u ∈ Rm such that u ≥ 0, uT A = 0T and uT b < 0. (ii) (D) is unfeasible if and only if there exists u ∈ Rn such that Au ≥ 0, ...
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Signed graph

In the area of graph theory in mathematics, a signed graph is a graph in which each edge has a positive or negative sign.Formally, a signed graph Σ is a pair (G, σ) that consists of a graph G = (V, E) and a sign mapping or signature σ from E to the sign group {+,−}. The graph may have loops and multiple edges as well as half-edges (with only one endpoint) and loose edges (with no endpoints). Half and loose edges do not receive signs. (In the terminology of the article on graphs, it is a multigraph, but we say graph because in signed graph theory it is usually unnatural to restrict to simple graphs.)The sign of a circle (this is the edge set of a simple cycle) is defined to be the product of the signs of its edges; in other words, a circle is positive if it contains an even number of negative edges and negative if it contains an odd number of negative edges. The fundamental fact about a signed graph is the set of positive circles, denoted by B(Σ). A signed graph, or a subgraph or edge set, is called balanced if every circle in it is positive (and it contains no half-edges). Two fundamental questions about a signed graph are: Is it balanced? What is the largest size of a balanced edge set in it? The first question is not difficult; the second is computationally intractable (technically, it is NP-hard).Signed graphs were first introduced by Harary to handle a problem in social psychology (Cartwright and Harary, 1956). They have been rediscovered many times because they come up naturally in many unrelated areas. For instance, they enable one to describe and analyze the geometry of subsets of the classical root systems. They appear in topological graph theory and group theory. They are a natural context for questions about odd and even cycles in graphs. They appear in computing the ground state energy in the non-ferromagnetic Ising model; for this one needs to find a largest balanced edge set in Σ. They have been applied to data classification in correlation clustering.
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