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.

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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