A Lower Bound On the Distance to the Nearest Uncontrollable System
A Lower Bound On the Distance to the Nearest Uncontrollable System
James Demmel
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N + • • • + Z„„) Letting Yj = ZJ^'-(s„_i • • • j^_]) we may rewrite this recurrence as Y„ = 1 Y„-, = a Yj = aYj + ^ + •^;^>+2 "•■ ^j^j + xYj+i + • • • + J/ • • • Since 0 nZin^ n [|X| + 2+(|X|2 + 4)i'M fci(l^l) (2) This bound decreases as |\| increases, so we need another bound that increases as |\| increases in order to get a bound independent of |X. |. To do this we use the same trick as before: dist(i4, B) = crn, i„[fi |A -X/] s crn, in[A -X. /]. As before, we need to bound ||(A-\/)~'|| from ...above to bound dist(A, B) from below.
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