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This quantum gas breaks classical rules, and physicists love it

Physicists have built a quantum gas that behaves nothing like the substances we are used to, and that is exactly why it is ...
Simon Fraser University

Finite Difference Approximations of Derivatives

First-order derivatives: n additional function calls are needed. Second-order derivatives based on gradient calls, when the "grd" module is specified (Dennis and Schnabel 1983): n additional gradient ...