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### Computer identification of plane regions

Aplikace matematiky

This paper gives a simple algorithm for the identification of the insidedness and the autsidedness of a plane bounded region. The region can be the union, intersection or difference of an arbitrary number of $k$-tuple connected regions.

### Envelope construction of two-parameteric system of curves in the technological practice

Programs and Algorithms of Numerical Mathematics

A two-parametric system of close planar curves is defined in the introduction of the presented article. Next a theorem stating the existence of the envelope is presented and proved. A mathematical model of the collecting mechanism of the Horal forage trailer is developed and used for practical demonstrations. The collecting mechanism is a double joint system composed of three rods. An equation describing the trajectory of a random point of the working rod is derived using Maple. The trajectories...

### Geogebra: la eficiencia de la intuición.

Gaceta de la Real Sociedad Matemática Española

### Gitterpunktanzahl in Simplex und Wills'sche Vermutung.

Mathematische Annalen

### Gröbner bases in geometry theorem proving and simplest degeneracy conditions.

Mathematica Pannonica

### Krümmungsabhängige Schrittweitensteuerung ohne höhere als erste Ableitung durch Nutzung eines kreisnahen Polygonstreifenmodells

Beiträge zur Algebra und Geometrie = Contributions to algebra and geometry

### Mini-programs for hidden lines on a surface

Aplikace matematiky

Many programs for the hidden lines on a surface are known [1] but these programs are long and need a large memory of the computer. In this paper we show algorithms and the corresponding mini-program in BASIC which can be implemented on minicomputers with plotters or plotting displays. We map the surface in the parallel or central projections.

### Projective planes of order 10 do not have a collineation of order 3.

Journal für die reine und angewandte Mathematik

### Software for Geometry

Visual Mathematics

### Über den Umriss der konvexen Flächen

Aplikace matematiky

In dem Artikel is eine Methode zur Konstruktion des Umrisses eines konvexen Gebildes beschrieben, die für automatische Bearbeitung geeignet ist.

### Visualization of the Lobachevskian Plane

Visual Mathematics