Truncus (mathematics)


In analytic geometry, a truncus is a curve in the Cartesian plane consisting of all points satisfying an equation of the form
File:Unit Truncus.png|right|thumb|300px|A mathematical graph of the basic truncus formula, marked in blue, with domain and range both restricted to .
where a, b, and c are given constants. The two asymptotes of a truncus are parallel to the coordinate axes. The basic truncus y = 1 / x2 has asymptotes at x = 0 and y = 0, and every other truncus can be obtained from this one through a combination of translations and dilations.
For the general truncus form above, the constant a dilates the graph by a factor of a from the x-axis; that is, the graph is stretched vertically when a > 1 and compressed vertically when 0 < a < 1. When a < 0 the graph is reflected in the x-axis as well as being stretched vertically. The constant b translates the graph horizontally left b units when b > 0, or right when b < 0. The constant c translates the graph vertically up c units when c > 0 or down when c < 0.
The asymptotes of a truncus are found at x = -b and y = c.