Examples of using Partial derivative in English and their translations into Hebrew
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Partial derivative of x with respect to z.
If you were to take just a partial derivative with respect to x.
Partial derivative of 0 with respect to x, 0.
And then I were to take the partial derivative with respect to y.
Partial derivative of minus y with respect to z.
Cross out its row and column, the partial derivative of x with respect to 0.
Or partial derivative of 0 with respect to x, actually.
This is just the derivative of psi, with respect to x,using the partial derivative chain rule.
Plus the partial derivative of x with respect to y.
Because the derivative of psi, with respect to x, using the partial derivative chain rules, is this.
Or the partial derivative of the[? vector?] z of minus y.
We took psi, up here, we treated the functions of x as a constant,and we just took the partial derivative with respect to y.
Well, the partial derivative of y with respect to x is just 0.
So what if I had, say, this function, psi,and I were to take the partial derivative of psi, with respect to x, first.
Minus the partial derivative of y-- of minus y with respect to y.
But maybe one day I will prove it a little bit more rigorously, butyou can find proofs on the web if you are interested, for the chain rule with partial derivatives.
So for example, take the partial derivative of this with respect to x, you're going to get this, right?
If you took the derivative of psi with respect to x, it should be equal to this whole thing,just using the partial derivative chain rule.
So if you took the partial derivative with respect to x of this term, you treat a function of y as a constant.
What we say is, since we have shown this exact,we know that there's some function psi where the partial derivative of psi with respect to x is equal to this expression right here.
We can take the partial derivative of this with respect to y, and we could call this function of x and y, M.
And we know that this differential equation, up here, can be rewritten as, the derivative of psi with respect to x,and that just falls out of the partial derivative chain rule.
So you're probablynot familiar with taking the chain rule onto partial derivatives, but I will show it to you now, and I will give you a little intuition.
You just take the partial derivative of the x component with respect to x, and you add that to the partial derivative to the y component with respect to y.
So let's put that aside and let's explore another property of partial derivatives, and then we're ready to get the intuition behind exact equations.
So when you took a partial derivative, with respect to x, not only do you lose constants-- that's why we have a plus c, normally-- but you also lose anything that's a function of just y.
So now, if we consider this whole thing our new M,the partial derivative of this with respect to y should be equal to the partial derivative of this with respect to x.
But when we took the partial derivative of this expression, which we could call M with respect to y, it was different than the partial derivative of this expression, which is N in the exact differential equations world.
So this is going to be equal to thepartial derivative of psi with respect to x plus the partial derivative of psi with respect to y times dy dx.
Similarly, this is going to be the partial derivative of psi, with respect to y, but when we do the test, we take the partial of it with respect to x so we get that mixed derivative. .