Projective frame
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In mathematics, a projective frame in projective geometry is an (n + 2)-tuple of points in general position in the space <math>{\mathbb{R}}^{n+1}<math> from which a projective space <math>{\mathbb{R}}P^n<math> has been projected, one can take the first n + 1 points to form a basis, and the last to be the sum of the others.