Automated Deduction in Geometry: 6th International Workshop, by Xiaoyu Chen, Dongming Wang (auth.), Francisco Botana, Tomas

By Xiaoyu Chen, Dongming Wang (auth.), Francisco Botana, Tomas Recio (eds.)

The papers during this quantity exhibit the energetic number of issues and techniques in automatic deduction in geometry.

They additionally reveal their applicability to various branches of arithmetic in addition to to different sciences and technologies.

The publication is made of the completely refereed post-proceedings of the sixth foreign Workshop on computerized Deduction in Geometry, ADG 2006, held at Pontevedra, Spain, in 2006.

There are a complete of thirteen revised complete papers chosen from a couple of submissions made after a decision for papers.

The package deal contains Springer’s hallmark on-line documents and updates.

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Extra info for Automated Deduction in Geometry: 6th International Workshop, ADG 2006, Pontevedra, Spain, August 31-September 2, 2006. Revised Papers

Example text

In every case, these regions are equidecomposable with a finite disjoint collection of primitive regions. Thus, all of the volume calculations of that proof can be handled by an automated procedure. 2 Petal Figures To motivate what is to come, we begin with the simple case of two dimension petal figures. ” When we speak of the complement of an open set A ⊂ Ω, we mean the set Ω \ A. Definition 1. A petal is a convex region in Ω, whose boundary is formed by a finite set of line segments and arcs of circles.

When f1 = 0 defines a sphere, the argument is almost the same. In this case the charts lie on the surface of a sphere. The chart is a spherical triangle, which is the boundary of a uniquely determined solid triangle F . The function T∗ f2 cuts F into two pieces. In both cases (both cone and sphere), the pieces F± belong to A. The only nonplanar edge on these pieces is the interval I on Cj . There are unique constants b± such that g = ai χ(Ai ) + b+ χ(F+ ) + b− χ(F− ) has J(g, f1 , ±T∗ f2 , Cj , I ) = 0.

We call these quadratic regions. Among the quadratic regions are a special subset that we call primitive. All the primitive regions are familiar shapes. The question we ask is when a quadratic region is equidecomposable with a finite disjoint collection of primitive quadratic regions. When such a decomposition can be produced, we obtain a formula for the volume of the quadratic region in terms of primitives. This research has been supported by NSF grant 0503447. F. Botana and T. ): ADG 2006, LNAI 4869, pp.

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