Examples of using This notation in English and their translations into Thai
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Colloquial
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Ecclesiastic
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Ecclesiastic
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Computer
We have seen this notation before.
But I just wanted to introduce you to this notation.
This notation right here just means subset, some subset of T.
And we will sometimes see this notation right here.
This notation just says the limit as I approach from the negative side.
How would we write this in this notation?
We could reverse this notation and say that A is a superset of B.
The limit as x approaches 0 from the positive direction, that's this notation here, of 1/x, right?
But I don't like using this notation most of the time, because it can be ambiguous.
And I'm writing this on purpose, because I want to get you used to this notation.
I like this notation better. x1 plus 3x2, 5x2 minus x1, and then 4x1 plus x2.
It might be a little confusing for you right now to have this notation right there because everything we have done so far.
When I write this notation, I want to be careful, I mean, really, just right below 0.
Actually, I'm going to leave it there because really I just wanted to introduce this notation and get you familiar with it.
And, this notation right over here, this whole expression, is called: the indefinite integral.
We can say that y is equal to-- and I'm going to throw some very fancy notation at you and actually I will explain why we use this notation in a couple presentations down the road.
And actually this notation will make a lot more sense when I show you what a definite integral is.
We could say that the transformation is a mapping from any vector in r2 that looks like this: x1, x2, to-- and I will do this notation-- a vector that looks like this. x1 plus x2 and then 3x1.
I'm just switching to this notation because we're used to thinking of this as the y-axis access as opposed to the x1 and x2 axis.
And so the divergence-- I will use this notation-- the divergence of our vector field is just a partial derivative with respect to x, which is just minus 1/2.
And because of this notation, a lot of people view this delta operator-- and actually it's pretty consistent when we learn about the divergence and the curl-- a lot of people view this delta operator.
That's what this sigma notation is.
Then we take the partial derivative-- this is the notation.
We can write that B is a subset of A, this is the notation.