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Ecologists Struggle to Get a Grip on ‘Keystone Species’
More than 50 years after Bob Paine’s experiment with starfish, hundreds of species have been pronounced “keystones” in their ecosystems. Has the powerful metaphor lost its mathematical meaning? Anne Salomon’s...
Strangely Curved Shapes Break 50-Year-Old Geometry Conjecture
...Cheeger of the Courant Institute of Mathematical Sciences at New York University. “And how in God’s name could you construct a counterexample to it?” In this area of mathematics, said...