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a line divides a plane into three disjoint sets.
The three disjoint sets are:
1.greater than the line.
2.less than the line.
3. the line itself.
in rectangular co-ordinate system,
the Y-axis divides the plane as x>0,y>0
x=o&y>0
x<0&y>0
all the above ones are disjoint.
since intersection of disjoint sets is null set,
therefore,quadrant 1 intersection quadrant 2 is null.
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∙ 11y ago
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