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单词 Nonperturbative
释义

Nonperturbative

英语百科

Non-perturbative

(重定向自Nonperturbative)

In mathematics and physics, a non-perturbative function or process is one that cannot be accurately described by perturbation theory. An example is the function

f(x)=e^{-1/x^2}.

The Taylor series at x = 0 for this function is exactly zero to all orders in perturbation theory, but the function is non-zero if x ≠ 0.

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