title: Truncus (mathematics)
text: # Truncus (mathematics)
  
  In analytic geometry, a truncus is a curve in the Cartesian plane consisting of all points (x,y) satisfying an equation of the form
  
  $f(x)={a \over (x+b)^{2}}+c$
  
  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 / $x^2$ 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 (for the vertical asymptote) and y = c (for the horizontal asymptote).
  
  This function is more commonly known as a reciprocal squared function, particularly the basic example $1/x^{2}$.
  
  