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Euclid's Book 1 begins with 23 definitions — such as point, line, and surface.
Following a visual illustration.
The first few definitions are:
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Definition 1.
A point is that which has no part.
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Definition 2.
A line is breadthless length.
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Definition 3.
The ends of a line are points.
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Definition 4.
A straight line is a line which lies evenly with the points on itself.
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