By assuming the weak lens focal length expression to be the first term in a power series a simple and accurate formula can be derived for the objective focal length of a magnetic electron lens.
用假设弱透镜焦距表达式是一个幂级数中的第一项的方法，可以导出相当准确且便于实用的电磁电子透镜物镜焦距公式。
The first thing you have to realize about proving Taylor's theorem is that there are infinitely many versions of Taylor's theorem: one for each possible expression of the remainder term.
要证明泰勒定理你必须意识到的第一件事就是泰勒定理有无限多版本即一对每个可能表达的余项。
The first thing you have to realize about proving Taylor's theorem is that there are infinitely many versions of Taylor's theorem: one for each possible expression of the remainder term.
要证明泰勒定理你必须意识到的第一件事就是泰勒定理有无限多版本即一对每个可能表达的余项。
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