So not only do we have this huge amount of spectrum,

And let's say someone just said in another room, not looking at your plants, just said, well, you know, how tall are your plants?

less than 12 away from 0, well, you could go all the way to positive 12, and you could go all the way to negative 12.

We're definitely going to match 1368 because it's in the language of this regular expression.

And by definition, these smallest numbers are always prime numbers.

After we are done with that digit, we move onto the next digit.

We could write that as 5.5.

One of the rules of the game said that every number had to be unique.

But over here on the right I've put this sort of if conditional, a guard or a predicate we might call it in mathematics, and this is saying I only want you to yield those numbers for which the predicate is true.

HTTP and our web app doesn't know whether the user is typing in numbers or strings or whatever, so we get all strings, and we have to make sure our string is made up of digits.

Please don't interrupt.

Let's say I want to sort numbers, as a simple example I've done it with.

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Farrington Street. I thought it as well to have Jones with us also.

Which expression could be one of his correct factors?

Twitter is based around a very simple, seemingly trivial concept.

First, the function name is a lowercase word made up of 1 or more lowercase letters, a z .

Well, what we do is, we literally just add up the numbers.

He said abort.

I mean, why would you want to do all these things for real?

And then I have ten 1s here, so I add 10 3, it becomes 13.

I'm going to introduce a tool that will help us do just that a tool called regular expressions.

OK, now this is an interesting one because immediately, when

So all the examples we've seen so far, all of the elements in the list had the same type.

There are going to be three different numbers.

A philosopher known as Euclid of Alexandria understood that all numbers could be split into these two distinct categories.

You said you could drive.

Alright. So, we've written this XMLHttp request code a few times now. Let's go ahead and extract it out.

And afterwards we can have zero or more digits or underscores.

We do it in 17 countries of the developing world.

So let me do an example where I don't just have Rn,

You can't do it the other way, at least, until we learn negative numbers.

What numbers are less than 7 and 1 2 away from 0?

The trick is to use a Ulam spiral.

We're going to have to decide what it means for something to be a function.

Both of those things do add more capacity, but we won't worry about that right now.

Home

I'm just going to call it number.

This could be any name at all as long as each node has a unique name.

So they are now sending the character back into that world.

I get these two pieces of paper, not like this, A4 format, so it's much bigger.

(And we'll talk more about digits in a future video.)

When arithmetic is a noun, we call it arithmetic. When it's an adjective like this, we call it arithmetic, arithmetic mean.

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Maybe if we each took a couple of minutes just to...