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PRIMITIVE CONCEPTS (POINT (LINE (SUCCESSION ENDLESS OF POINTS (HALF-LINE…
PRIMITIVE CONCEPTS
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PLANE
HALF-PLANE
IF WE TAKE TWO POINTS THAT BELONG TO THE SAME HALF-PLANE , THE SEGMENT THAT JOINS THEM DOESN'T INTERSECT THE LINE; INSTEAD, IF WE TAKE TWO POINTS THAT DON'T BELONG TO THE SAME HAL-PLANE, THE SEGMENT THAT JOINS THEM INTERSECTS THE LINE
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GIVEN A PLANE AND A LINE LYING ON IT, WE CALL IT "HALF-PLANE" THE FIGURE COMPOSED BY THE LINE AND BY EACH OF THE TWO PARTS IN WICH IT DIVIDES THE PLANE. THIS LINE IS NAMED ORIGIN OF THE HALF-PLANE
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