Sometimes people will talk about change in heat.

Y minus y sub 1 or you could call it some constant is equal to let's call it, I want to use a capital A just because that tends to be I'll use a capital A and just know that it's different than this lowercase A.

That's totally allowed in the identifier, but we'll say not at the beginning.

Let me give a general form.

Letter, Uppercase

These are examples of internal character encoding that works with PHP and does NOT work with PHP.

A capital letter is used at the beginning of a sentence.

And the name of a procedure is just like the name of a variable.

So these are constants.

First Letter Upper

First letter uppercase

They won't be the same thing.

A capital letter is used at the beginning of a sentence.

Typesetting capital Greek letters

Case Sensitive

Case sensitive search

lower case k, right, so capital K is the total number centroids and I'm going to use lower case k here to index into the different centroids.

ISO 8859 , EUC JP, UTF 8 Character encodings do NOT work with PHP

Case sensitive matching

Case sensitive quicksearch

Case sensitive sorting

Match case

Case sensitive

Convert First Letter to Upper Case

Capitalize the first letter

Case Sensitive

You can also use function SEARCH, but unlike SEARCH, FIND is case sensitive and does not allow wildcard characters.

To show you that things are different with strings, let's try that with a string.

Character used for indicating positive numbers

So let's say that I have a parabola.

So you have this first one.

Upper Case

Uppercase letters

Upper

Uppercase

lower case Y for referring to vector and we usually use upper case to refer to a matrix.

The quadratic equation is minus b.

Sort descending

Converts the string to uppercase.

Convert all letters to upper case

Xi, Yi pairs of m training examples. I'm going to use upper case

All of this looks like 3 characters. It's really just 2.

Uppercase

Upper Case

Upper Alphabetical