Posted by Anonymous on Tuesday, January 12, 2010 at 4:16pm.
Let I denote the interval [0,oo). For each r (element of) I, define
Ar={(x,y)element of RxR:x^2+y^2=r^2}
Determine (UNION)reI Ar and (INTERSECT)reI Ar

Math  Marth, Tuesday, January 12, 2010 at 4:21pm
The definition of Ar (Ar={(x,y)element of RxR:x^2+y^2=r^2}) means that for any r>0, Ar contains all points on the circle of radius r centered on the origin.

Math  Anonymous, Tuesday, January 12, 2010 at 4:34pm
So how would you determine the Union & Intersection? I'm sure its simple...I'm just not getting it for some reason...as in how to write it out?

Math  Marth, Tuesday, January 12, 2010 at 4:39pm
Consider that if ALL possible radii are included, than for every point (x,y) there will exist an Ar that contains it.
Also, can you say that every Ar contains different points, so that there does not exist a point (x,y) that exists in Ar for different r?
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