1. (40 pts) Let U CR be an open. Show that U=ÙI ÚL i=1 where I; = (ai,bi), i EN (ai bi, di, bi € RU{-00, }) and I, nl, =
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1. (40 pts) Let U CR be an open. Show that U=ÙI ÚL i=1 where I; = (ai,bi), i EN (ai bi, di, bi € RU{-00, }) and I, nl, =
1. (40 pts) Let U CR be an open. Show that U=ÙI ÚL i=1 where I; = (ai,bi), i EN (ai bi, di, bi € RU{-00, }) and I, nl, = 0 if i #j.
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