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So before we really get going with electrodynamics, I think this is a good time to tell you that you



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need some mathematics to understand it, at least it's very helpful if you know about this.



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So I decided to add here a section where I revisited some of the mathematical concepts that are good



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to know.



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So here we will discover the complex numbers which consist of a real part and an imaginary part.



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We will talk about multidimensional derivatives and we will learn about the Nabala operator, the gradient,



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the Kearl and the divergence, and we will discuss multidimensional integration.



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And we will also use alternative coordinate systems like the spherical coordinates.



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So if you know about all of this, you are good to go.



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You can skip this whole course, this whole section at least, and go ahead to the next section where



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we will start discussing electrodynamics.



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And also, if you are unsure if you want to spend the next two hours on mathematics, I think it's also



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OK if you just skip ahead and start with the course.



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And then when you notice that there is something you don't really understand, you can always come back



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to this section and watch the videos.



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So please have fun and join the.