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Update calculus.md
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astonzhang authored Nov 10, 2022
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![用逼近法求圆的面积](../img/polygon-circle.svg)
:label:`fig_circle_area`

事实上,逼近法就是*积分*(integral calculus)的起源,
我们将在 :numref:`sec_integral_calculus`中详细描述。
事实上,逼近法就是*积分*(integral calculus)的起源。
2000多年后,微积分的另一支,*微分*(differential calculus)被发明出来。
在微分学最重要的应用是优化问题,即考虑如何把事情做到最好。
正如在 :numref:`subsec_norms_and_objectives`中讨论的那样,
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