Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. In geometry, the Moulton plane is an example for an affine plane in which Desargues' theorem does not hold. It is named after the American astronomer Forest Ray Moulton. The points of the Moulton plane are simply the points in the real plane R2 and the lines are the regular lines as well with the exception, that for lines with a negative slope the slope doubles when they pass the y-axis.

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