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.

like HTML or SQL, the language of database queries.

But the question I wanna pose to you. And I, I don't have a slide after this one.

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

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

And that is We are losing our tolerance for vulnerability.

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

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

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 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.

Well, because, sentences are more interesting.

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

I could just write artery and vein and essentially they would be behaving this way.

That line above it is the context.

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

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

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

We can take what exists and apply past examples within our own unique context today's perspective on tap dance.

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

It depends on the context.

This branch of the family is all about representation.

Here I've written down four claims.

These are both infinite, infinite grammars.

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

In most interpreters, this is a problem.

This is always true because we have our Pac Man diagram here, and also because you can take any regular language and represent it with a context free grammar.

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

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

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

That's an excellent question.

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

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

Is it the case that no regular languages are context free languages and vice versa?

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

You could have read it as A 13 C or 12 B 14 , but your brain created the context unconsciously.

Y has the value of 2.

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

The input doesn't really have to be meaningful.

It's as old as breathing.

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

It's a set of sets of strings.

Perhaps a stealth thing.