SAVE OVER $100: As of March 4, the 13-inch iPad Air (M3, 512GB, WiFi) is back to its lowest-ever price of $949 at Amazon. That's $150 off its list price of $1,099.
The complexity of determining the minimum number of flips that transform one triangulation of a convex point set into another remained a tantalizing open question for many decades. We settle this question by proving that computing shortest flip sequences between triangulations of convex polygons, and therefore also computing the rotation distance of binary trees, is NP-hard.
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