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Find the minimum value of |z-1 if ||z-3|...

Find the minimum value of `|z-1` if `||z-3|-|z+1||=2.`

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`2=||z-3|-|z+1||le|(z-3)+(z-1)|`
`implies|2z-2|ge2`
`implies|z-1|ge1`
Thus, minimum value of `|z-1|` is 1.
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