You might think, Boy, is there a context expensive grammar out there? What's the opposite of free?

These grammars that we've been introducing describe something new context free languages.

I am just gonna pause for a moment to let you think about that.

It relates grammars to parsing, which is one of the concepts in this class.

So in lecture, we spent a lot of time learning about context free grammars and languages.

But if right above it I've written X 0, then we'd get a different answer.

But that's an example of an application that also uses this sort of linguistic analysis perhaps a little less related to context free grammars but still in the same vein.

It depends on the context.

This branch of the family is all about representation.

Here I've written down four claims.

It handles LL. It handles LR. It handles LALR.

Finite State Machines, adding a lexer that follows them automatically,

like HTML or SQL, the language of database queries.

The set of languages that can be described by re write rules or grammers like this are called context free languages.

I'll call her.

... the misspelled word shown in context...

Well, because, sentences are more interesting.

Actually, they're both just concise notations for specifying possibly infinite sets of strings.

Y has the value of 2.

That line above it is the context.

All right. So, it's another one of these puzzle like questions.

They're the actual input that we're trying to match.

Sometimes this statement is true, and sometimes it's not.

This is called being lazy, and it's a phenomenal virtue when you're writing programs.

In most interpreters, this is a problem.

Here's a new quiz. The Great Grammar Fix Up.

In particular, it's a set of strings that can be represented by a finite state machine or a regular expression.

We'll talk about it in a lot of different contexts.

That's an excellent question.

In theory, you could compose it over here as well.

Build the system so that anybody can contribute at any amount.

The brain is recording all information and driving all change in temporal context.

A context free grammar can capture the language a N and b N, where N is the same.

That's much more important than knowing the particular syntax for any language.

Now, the last thing that I want to talk to you about is care customization, because if you've got care anywhere and you've got care networking, those are going to go a long way towards improving our health care system, but there's still too much guesswork.

These are both infinite, infinite grammars.

These are just the ESPN SportsCenter version of the game.

These days I think your time, the human's time, is more important than the computers.

That's a good point, Peter, and the answer is yes.

They may get a little bit bigger, but it will totally work.

Units 3 and 4 were relatively abstract to some degree, intentionally so.

The input doesn't really have to be meaningful.

All right. Now that you've gone to the hard work of defining all of those procedures,

Perhaps a stealth thing.

Another common story or storyline is the claim that we have to get tough .