We're going to define a procedure, so we use the def followed by the name.

Let's say I type max A and then this will be it.

Unbalanced right parenthesis

I haven't shown this to you yet.

Anything that we could use as a variable, we can use as the name of a procedure.

Braces

The Parentheses around option displays the numeric value within a pair of parentheses.

My first rule is going to handle.

That's an identifier, like myfun , followed by a Left parenthesis, followed by some optional arguments, followed by a Right parenthesis.

So just remember, the top priority is always going to be your parentheses.

Parentheses Around

Close parenthesis

If I were to change this a bit. I've been very minorly devious.

Let's see what we can do.

We didn't really remember where we'd come from.

We say that this first option is what is known as

We could also look at it like this.

AutoBrace

Bracket highlight

But 6x minus x is 5x.

I factored it out of both of these guys.

And here's how to see it

Opening and closing parentheses do not match in regular expression.

Missing parenthesis

Move to Matching Bracket

Select to Matching Bracket

Now we are going to learn how to use a procedure.

A compound statement is a sequence of statements in between a left brace and a right brace. the rules for statements, statements can be empty, so you can have nothing in your between your left and right braces or it can be a single statement and a followed by more statements.

Missing right parenthesis

You have that 5.

This is 4 y squared.

So let's try a few examples. So we'll create a dictionary.

There could be one input.

Here, we're not including 10 3.

Let's see if we can simplify this a little bit.

So that one wasn't too bad.

You would just have to follow the order of operations.

And so now, we just simplify this.

I can rewrite this up here as 2x squared plus 2x plus 3x plus 3, just like that.

You're never at infinity.

Way up at the top of this file, I've defined a particular grammar.

Negative 1 times 3 is negative 3.

I just factored a negative 1 out.

Although again, if it's a single line, you don't require those braces to be there.

This is the wrong approach.