In this note we show the optimal gradient estimate for heat kernels of stable-like operators by providing a counterexample. Journal Information This monthly journal, begun in 1950, is devoted entirely ...
Haley Mast is a freelance writer, fact-checker, and small organic farmer in the Columbia River Gorge. She enjoys gardening, reporting on environmental topics, and spending her time outside ...
Driving force An experiment has confirmed that an oscillating temperature gradient boosts heat flow in fluids. (Courtesy: iStock/Mervana) Physicists in the Czech Republic have shown that heat flows ...
As the planet warms, more people need air conditioners—but traditional ACs use a lot of energy and exacerbate global warming. The Gradient ($1,999, pre-order for 2023 delivery) aims to break this doom ...
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