I am having trouble understanding how the indexed union of ln in the first picture is equal to a subset of the plane; an element of it is a point on one of the lines. If I were to choose say 0 1 2 then the indexed union should be y=0 union y=1 union y=2. These lines would have no points in common so the total indexed union should be the empty set. I understand the second second set, it is the indexed union giving me trouble. Sorry if the pictures are blurry my phone isn't the greatest.(adsbygoogle = window.adsbygoogle || []).push({});

http://i603.photobucket.com/albums/tt113/KtmPayton/0306132054.jpg

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# Indexed Unions

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