https://www.quantamagazine.org/

“Resurgence is very fancy,” Bender said. But, to put it as simply as
possible, it lets practitioners dig into the distant terms of an asymptotic
series (calculated using Feynman diagrams, for instance) and uncover the
missing pieces necessary to specify a unique function (one that describes
tunneling, say). In short, it reveals a bridge linking physical events
described by perturbation theory with those described by the
nonperturbative terms. “It’s a very complicated relationship,” Bender said,
before politely declining to attempt to explain it.

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