Abstract
Although Alan and I have worked on this Theme Issue together, it also serves as a celebration—a Festschrift, as the Germans have it—of his 85th birthday. Happy birthday Alan, many happy returns; ique cumplas muchos mas! as they say here in Granada, from all of us involved in this issue. 
Schedule a callMore From: Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences
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