Question

In: Math

Assign the coordinates to each point on an Affine plane of order 3.

Assign the coordinates to each point on an Affine plane of order 3.

Solutions

Expert Solution

If the number of points in an affine plane is finite, then if one line of the plane contains n points then:

  • each line contains n points,
  • each point is contained in n + 1 lines,
  • there are n2 points in all, and
  • there is a total of n2 + n lines.

The number n is called the order of the affine plane. The n2 + n lines of an affine plane of order n fall into n + 1 equivalence classes of n lines apiece under the equivalence relation of parallelism.

Affine plane of order 3 : there are 9-points, 12-lines and 4- Equivalence classes of parallel lines.

Start with a finite field of order 3:

                             

Now you can draw the points as a 3×3 grid using these elements as x and y coordinates. That's the n2 points you'd expect from an affine plane of order n. You can also draw lines of constant x coordinate (i.e. vertical lines), and non-vertical lines with equations y=mx+c where m and x are again elements from your field. This is n+n2 lines, as expected.

It doesn't really matter how you draw the lines, as long as the points on each line come from the same equation. If the lines you draw intersect in points besides the 9 points in the plane, that simply doesn't count as an intersection. So one possible illustration would be this:

* I hope This helps you *


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