Affine Point

<p>Def: An affine point <i>A</i> = [<i>x, y</i>] is a pair of rational numbers in square brackets.

They are denoted by capital letters.

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As a projective coordinate an affine point &#160;<i>A</i> = [<i>x, y</i>] becomes <i>A = [x:y:1]</i></p>