称之为区域R上fdA的二重积分,会向大家解释这些符号的含义的。
So, we'll call that the double integral of our region, R, of f of xy dA and I will have to explain what the notation means.
为了提醒我们是在封闭曲线上做积分，经常在积分符号上加个圆圈，告诉我们，这条曲线自我封闭。
To remind ourselves that we are doing it along a closed curve, very often we put just a circle for the integral to tell us this is a curve that closes on itself.
当计算二重积分时，要多了解这些符号的具体含义。
OK, we'll come up with more concrete notations when we see how to actually compute these things.
接收部分主要是扩频系统的数字下变频、积分清洗、匹配滤波器解扩、功率检测、符号跟踪、差分译码等技术。
The receiver unit mainly consisted of the digital down converter, matched filter, integration and dump module, power detector, symbol tracking processor, differential demodulator and so on.
导通率控制和带符号变速积分PID软件比较新颖。
The software of the duty factor control and the variable speed integrating PID with symbol are newer.
利用凸函数或微积分中二阶导数符号可以直接给出一连串不等式。
That is, a succession of inequations can be obtained directly by using convex functions or quadratic derivative symbols in calculous.
现在我们使用的微积分通用符号就是当时莱布尼茨精心选用的。
Now we use the calculus is the universal symbol Leibniz was carefully chosen.
现在我们使用的微积分通用符号就是当时莱布尼茨精心选用的。
Now we use the calculus is the universal symbol Leibniz was carefully chosen.
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